Table:
0
A
B
C
D
E
F
G
H
I
1
staff id
staff address id
nickname
first name
middle name
last name
date of birth
date joined staff
date left staff
2
1
14
thompson.constantin
Janessa
Amara
Sawayn
12/8/2010 16:55
4/27/2017 3:21
3/23/2018 22:53
3
2
3
santos45
Camylle
Icie
Weissnat
8/1/2015 13:22
6/6/2016 8:54
3/10/2018 15:25
4
3
5
ynader
Kaitlin
Stephania
Mertz
5/17/1994 5:32
1/2/2018 12:24
3/24/2018 10:11
5
4
1
lsenger
Rebekah
Sherwood
Hermann
1/16/2003 6:29
10/21/2017 17:20
3/4/2018 17:13
6
5
14
ledner.jamie
Jedidiah
Dejon
Herzog
8/10/2015 11:37
5/16/2016 20:56
3/8/2018 4:23
7
6
12
bogisich.geovany
Eulalia
Tre
Maggio
4/27/1998 12:55
8/27/2017 19:19
2/28/2018 8:26
8
7
13
weldon.kling
Queenie
Madelyn
Macejkovic
6/11/2007 20:03
6/4/2017 14:30
3/8/2018 5:16
9
8
1
gabe21
Titus
Duane
Durgan
5/2/2005 6:23
5/26/2016 0:55
3/5/2018 18:30
10
9
4
ymiller
Margie
Caesar
Doyle
6/3/1995 8:09
12/22/2017 3:06
3/8/2018 12:31
11
10
2
sbrown
Jaleel
Maiya
Rogahn
9/24/1996 9:51
6/5/2016 22:22
3/14/2018 7:14
12
11
1
nicholaus92
Winnifred
Liam
Jast
6/13/2000 18:09
5/1/2016 2:22
3/9/2018 5:08
13
12
7
edwin.hudson
Lincoln
Benny
Carroll
3/9/1996 8:19
11/5/2016 1:43
3/6/2018 23:17
14
13
1
norma73
Ernestina
Clarabelle
Mraz
5/19/2004 14:11
11/13/2016 20:44
2/26/2018 17:56
15
14
6
bkunze
Ludie
Ulices
Kuphal
11/16/2000 6:55
8/30/2017 15:08
3/2/2018 1:48
16
15
3
weissnat.vincenzo
Simeon
Mayra
Turner
3/29/1997 10:55
2/20/2017 18:45
3/1/2018 17:10

Questions and formulas:
Question: List the first name middle name and last name of all staff.
Formula: CHOOSE({1,2,3},D1,E1,F1)
Formula2: CHOOSE({1,2,3},D2:D16,E2:E16,F2:F16)
Level: easy
Question: What is the birthday of the staff member with first name as Janessa and last name as Sawayn?
Formula: FILTER(G1,(D1="Janessa")*(F1="Sawayn"))
Formula2: FILTER(G2:G16,(D2:D16="Janessa")*(F2:F16="Sawayn"))
Level: easy
Question: What is the date of birth for the staff member named Janessa Sawayn?
Formula: FILTER(G1,(D1="Janessa")*(F1="Sawayn"))
Formula2: FILTER(G2:G16,(D2:D16="Janessa")*(F2:F16="Sawayn"))
Level: easy
Question: How many staff have the first name Ludie?
Formula: SUMIFS(A1,D1,"ludie")
Formula2: SUMIFS(A2:A16,D2:D16,"ludie")
Level: easy
Question: How many employees have a first name of Ludie?
Formula: ROWS(FILTER(A1:I1, D1="ludie"))
Formula2: ROWS(FILTER(A2:I16, D2:D16="ludie"))
Level: easy
Question: What is the nickname of staff with first name as Janessa and last name as Sawayn?
Formula: FILTER(C1,(D1="Janessa")*(F1="Sawayn"))
Formula2: FILTER(C2:C16,(D2:D16="Janessa")*(F2:F16="Sawayn"))
Level: easy
Question: What is the nickname of the employee named Janessa Sawayn?
Formula: FILTER(C1,(D1="Janessa")*(F1="Sawayn"))
Formula2: FILTER(C2:C16,(D2:D16="Janessa")*(F2:F16="Sawayn"))
Level: easy
Question: How many staff in total?
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy
Question: Full names and staff ids.
Formula: UNIQUE(HSTACK(D1,E1,F1,A1))
Formula2: UNIQUE(HSTACK(D2:D16,E2:E16,F2:F16,A2:A16))
Level: easy
Question: the birthday and staff id of janessa sawayn.
Formula: LET(query1,FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),UNIQUE(CHOOSECOLS(query1,7,1)))
Formula2: LET(query1,FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),UNIQUE(CHOOSECOLS(query1,7,1)))
Level: hard
Question: janessa sawayn's birthday and staff ID 
Formula: LET(query1,FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),UNIQUE(CHOOSECOLS(query1,7,1)))
Formula2: LET(query1,FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),UNIQUE(CHOOSECOLS(query1,7,1)))
Level: hard
Question: How many staff are called ludie?
Formula: SUMIFS(A1,D1,"ludie")
Formula2: SUMIFS(A2:A16,D2:D16,"ludie")
Level: easy
Question: How many employees called ludie?
Formula: ROWS(FILTER(A1:I1, D1="ludie"))
Formula2: ROWS(FILTER(A2:I16, D2:D16="ludie"))
Level: easy
Question: What is Janessa Sawayn's nickname and staff ID? 
Formula: LET(query1,FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),UNIQUE(CHOOSECOLS(query1,3,1)))
Formula2: LET(query1,FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),UNIQUE(CHOOSECOLS(query1,3,1)))
Level: hard
Question: Janessa sawayn's nickname
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),3))
Level: medium
Question: total number of staff.
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy
Question: Birthday and staff id of janessa sawayn.
Formula: LET(query1,FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),UNIQUE(CHOOSECOLS(query1,7,1)))
Formula2: LET(query1,FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),UNIQUE(CHOOSECOLS(query1,7,1)))
Level: hard
Question: How many staff called ludie?
Formula: SUMIFS(A1,D1,"ludie")
Formula2: SUMIFS(A2:A16,D2:D16,"ludie")
Level: easy
Question: How many employees named ludie?
Formula: ROWS(FILTER(A1:I1, D1="ludie"))
Formula2: ROWS(FILTER(A2:I16, D2:D16="ludie"))
Level: easy
Question: What is the nickname and staff id of janessa sawayn?
Formula: LET(query1,FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),UNIQUE(CHOOSECOLS(query1,3,1)))
Formula2: LET(query1,FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),UNIQUE(CHOOSECOLS(query1,3,1)))
Level: hard
Question: the nickname of janessa sawayn.
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,(D1="janessa")*(F1="sawayn")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I16,(D2:D16="janessa")*(F2:F16="sawayn")),3))
Level: medium
Question: the number of staff
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy