SQL — WHERE & filtering

1 Select all employees Easy 2 Select specific columns Easy 3 Filter category X #1 Hard 4 Filter category X #2 Medium 5 Filter category X #3 Medium 6 Filter category X #4 Hard 7 Filter category X #5 Medium 8 Filter category X #6 Medium 9 Filter category X #7 Hard 10 Filter category X #8 Medium 11 Filter category X #9 Medium 12 Filter category X #10 Hard 13 Filter category X #11 Medium 14 Filter category X #12 Medium 15 Filter category X #13 Hard 16 Filter category X #14 Medium 17 Filter category X #15 Medium 18 Filter category X #16 Hard 19 Filter category X #17 Medium 20 Filter category X #18 Medium 21 Filter category X #19 Hard 22 Filter category X #20 Medium 23 Filter category X #21 Medium 24 Filter category X #22 Hard 25 Filter category X #23 Medium 26 Filter category X #24 Medium 27 Filter category X #25 Hard 28 Filter category X #26 Medium 29 Filter category X #27 Medium 30 Filter category X #28 Hard 31 Filter category X #29 Medium 32 Filter category X #30 Medium