SQLite - WHERE Clause

SQLite WHERE clause is used to specify a condition while fetching the data from one table or multiple tables.
If the given condition is satisfied, means true, then it returns the specific value from the table. You will have to use WHERE clause to filter the records and fetching only necessary records.
The WHERE clause not only is used in SELECT statement, but it is also used in UPDATE, DELETE statement, etc., which will be covered in subsequent chapters.
Following is the basic syntax of SQLite SELECT statement with WHERE clause.
SELECT column1, column2, columnN 
FROM table_name
WHERE [condition]

You can specify a condition using Comparision or Logical Operators such as >, <, =, LIKE, NOT, etc. Consider COMPANY table with the following records −
ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0
Following is a simple examples showing the usage of SQLite Logical Operators. Following SELECT statement lists down all the records where AGE is greater than or equal to 25 AND salary is greater than or equal to 65000.00.
sqlite> SELECT * FROM COMPANY WHERE AGE >= 25 AND SALARY >= 65000;

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
Following SELECT statement lists down all the records where AGE is greater than or equal to 25 OR salary is greater than or equal to 65000.00.
sqlite> SELECT * FROM COMPANY WHERE AGE >= 25 OR SALARY >= 65000;

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
Following SELECT statement lists down all the records where AGE is not NULL, which means all the records because none of the record has AGE equal to NULL.
sqlite>  SELECT * FROM COMPANY WHERE AGE IS NOT NULL;

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0
Following SELECT statement lists down all the records where NAME starts with 'Ki', does not matter what comes after 'Ki'.
sqlite> SELECT * FROM COMPANY WHERE NAME LIKE 'Ki%';

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
6           Kim         22          South-Hall  45000.0
Following SELECT statement lists down all the records where NAME starts with 'Ki', does not matter what comes after 'Ki'.
sqlite> SELECT * FROM COMPANY WHERE NAME GLOB 'Ki*';

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
6           Kim         22          South-Hall  45000.0
Following SELECT statement lists down all the records where AGE value is either 25 or 27.
sqlite> SELECT * FROM COMPANY WHERE AGE IN ( 25, 27 );

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
2           Allen       25          Texas       15000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
Following SELECT statement lists down all the records where AGE value is neither 25 nor 27.
sqlite> SELECT * FROM COMPANY WHERE AGE NOT IN ( 25, 27 );

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
3           Teddy       23          Norway      20000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0
Following SELECT statement lists down all the records where AGE value is in BETWEEN 25 AND 27.
sqlite> SELECT * FROM COMPANY WHERE AGE BETWEEN 25 AND 27;

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
2           Allen       25          Texas       15000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
Following SELECT statement makes use of SQL sub-query, where sub-query finds all the records with AGE field having SALARY > 65000 and later WHERE clause is being used along with EXISTS operator to list down all the records where AGE from the outside query exists in the result returned by the sub-query −
sqlite> SELECT AGE FROM COMPANY 
   WHERE EXISTS (SELECT AGE FROM COMPANY WHERE SALARY > 65000);

AGE
----------
32
25
23
25
27
22
24
Following SELECT statement makes use of SQL sub-query where sub-query finds all the records with AGE field having SALARY > 65000 and later WHERE clause is being used along with > operator to list down all the records where AGE from the outside query is greater than the age in the result returned by the sub-query.
sqlite> SELECT * FROM COMPANY 
   WHERE AGE > (SELECT AGE FROM COMPANY WHERE SALARY > 65000);

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0

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