lianghsun/bird-text2sql-bench huggingface dataset:
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
In female customers ages from 50 to 60, how many of them has an number of inhabitants ranges from 19 to 24?

### Hint
female customers ages from 50 to 60 refer to SEX = 'Female' where age BETWEEN 50 AND 60; number of inhabitants ranges from 19 to 24 refers to INHABITANTS_K BETWEEN 19 AND 24;

### SQL
SELECT COUNT(T1.ID) FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID WHERE T1.SEX = 'Female' AND T1.age >= 50 AND T1.age <= 60 AND T2.INHABITANTS_K >= 19 AND T2.INHABITANTS_K <= 24
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
List the income and number of inhabitants of customers with an age greater than the 80% of average age of all customers?

### Hint
age greater than the 80% of average age refers to age > (AVG(age) * 0.8); income refers to INCOME_K; number of inhabitants refers to INHABITANTS_K;

### SQL
SELECT T2.INCOME_K, T2.INHABITANTS_K FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID GROUP BY T2.INCOME_K, T2.INHABITANTS_K HAVING T1.age > 0.8 * AVG(T1.age)
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
In customers with marital status of never married, what is the percentage of customers with income of 2500 and above?

### Hint
DIVIDE(COUNT(INCOME_K ≥ 2500 where MARITAL_STATUS = 'Never-married'), COUNT(INCOME_K where MARITAL_STATUS = 'Never-married')) as percentage;

### SQL
SELECT CAST(SUM(CASE WHEN T2.INCOME_K > 2500 THEN 1.0 ELSE 0 END) AS REAL) * 100 / COUNT(*) FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID WHERE T1.MARITAL_STATUS = 'Never-married'
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
Find and list the id and geographic ID of the elderly customers with an education level below 3.

### Hint
elderly customers with an education level below 3 refer to age > 65 where EDUCATIONNUM < 3; geographic ID refers to GEOID;

### SQL
SELECT ID, GEOID FROM Customers WHERE EDUCATIONNUM < 3 AND age > 65
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
List the geographic id of places where the income is above average.

### Hint
geographic ID refers to GEOID; income is above average refers to INCOME_K > DIVIDE(SUM(INCOME_K), COUNT(GEOID));

### SQL
SELECT AVG(INCOME_K) FROM Demog
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
Calculate the number of customers who did not respond in February of 2007.

### Hint
did not respond refers to RESPONSE = 'false'; February of 2007 refers to REF_DATE BETWEEN '2007-02-01 12:00:00.0'AND '2007-02-28 12:00:00.0';

### SQL
SELECT COUNT(REFID) custmoer_number FROM Mailings1_2 WHERE RESPONSE = 'false' AND REF_DATE BETWEEN '2007-02-01' AND '2007-02-28'
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
How many teenagers are working as Machine-op-inspct?

### Hint
teenager is a person aged between 13 and 19 years; OCCUPATION = 'Machine-op-inspct';

### SQL
SELECT COUNT(ID) teenager_number FROM Customers WHERE OCCUPATION = 'Machine-op-inspct' AND age >= 13 AND age <= 19
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
Of customers who provide other services, how many are from places where inhabitants are more than 20000?

### Hint
OCCUPATION = 'Other-service'; inhabitants are more than 20000 refer to INHABITANTS_K > 20;

### SQL
SELECT COUNT(T2.GEOID) FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID WHERE T1.OCCUPATION = 'Other-service' AND T2.INHABITANTS_K > 20
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
Among the male customer in their twenties, how many are from places where the average income is more than 3000?

### Hint
male customer in their twenties refer to SEX = 'Male' where age BETWEEN 20 AND 29; average income is more than 3000 refers to INCOME_K > 3000;

### SQL
SELECT COUNT(T2.GEOID) FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID WHERE T1.SEX = 'Male' AND T2.INCOME_K > 3000 AND T1.age >= 20 AND T1.age <= 29
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
What percentage of elderly customers who are never married in the place with geographic ID 24?

### Hint
elderly customers refer to age > 65; DIVIDE(COUNT(ID where age > 65, MARITAL_STATUS = 'never married' and GEOID = 24), COUNT(ID where GEOID = 24)) as percentage;

### SQL
SELECT CAST(SUM(CASE WHEN T1.MARITAL_STATUS = 'never married' THEN 1.0 ELSE 0 END) AS REAL) * 100 / COUNT(*) FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID WHERE T1.GEOID = 24
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
Among the customers with an average income per inhabitant above 3000, what percentage are in their eighties?

### Hint
average income per inhabitant above 3000 refers to INCOME_K > 3000; eighties refer to age BETWEEN 80 AND 89; DIVIDE(COUNT(INCOME_K > 3000 and age BETWEEN 80 AND 89), COUNT(INCOME_K > 3000 )) as percentage;

### SQL
SELECT CAST(SUM(CASE WHEN T1.age BETWEEN 80 AND 89 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.ID) FROM Customers AS T1 INNER JOIN Demog AS T2 ON T1.GEOID = T2.GEOID WHERE T2.INCOME_K > 3000
### Database Schema
CREATE TABLE Demog
(
    GEOID         INTEGER
        constraint Demog_pk
            primary key,
    INHABITANTS_K REAL,
    INCOME_K      REAL,
    A_VAR1        REAL,
    A_VAR2        REAL,
    A_VAR3        REAL,
    A_VAR4        REAL,
    A_VAR5        REAL,
    A_VAR6        REAL,
    A_VAR7        REAL,
    A_VAR8        REAL,
    A_VAR9        REAL,
    A_VAR10       REAL,
    A_VAR11       REAL,
    A_VAR12       REAL,
    A_VAR13       REAL,
    A_VAR14       REAL,
    A_VAR15       REAL,
    A_VAR16       REAL,
    A_VAR17       REAL,
    A_VAR18       REAL
)

CREATE TABLE mailings3
(
    REFID    INTEGER
        constraint mailings3_pk
            primary key,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Customers"
(
    ID             INTEGER
        constraint Customers_pk
            primary key,
    SEX            TEXT,
    MARITAL_STATUS TEXT,
    GEOID          INTEGER
        constraint Customers_Demog_GEOID_fk
            references Demog,
    EDUCATIONNUM   INTEGER,
    OCCUPATION     TEXT,
    age            INTEGER
)

CREATE TABLE "Mailings1_2"
(
    REFID    INTEGER
        constraint Mailings1_2_pk
            primary key
        constraint Mailings1_2_Customers_ID_fk
            references Customers,
    REF_DATE DATETIME,
    RESPONSE TEXT
)

CREATE TABLE "Sales"
(
    EVENTID    INTEGER
        constraint Sales_pk
            primary key,
    REFID      INTEGER
        references Customers,
    EVENT_DATE DATETIME,
    AMOUNT     REAL
)

### Question
How many of the customer's reference ID that has a TRUE response?

### Hint
reference ID refers to REFID;

### SQL
SELECT COUNT(REFID) FROM Mailings1_2 WHERE RESPONSE = 'true'