added some lines

Author: AnuragAnalog

README.md

@@ -305,6 +305,8 @@ select stddev(population) from city group by population;
 select group_concat(population) from city group by population;
 ```
 
+> Only COUNT function considers NULL values
+
 ## Procedure
 
 #### Creating procedure

where.sql

@@ -0,0 +1,141 @@
+
+-- Setting up basic stuff to work on them
+create database cheatsheet;
+use cheatsheet;
+
+create table if not exists employee
+(
+    employee_id int,
+    name varchar(20),
+    months int,
+    salary int
+);
+
+insert into employee values (330,"Rose",5,2248);
+insert into employee values (1233,"Angela",7,1296);
+insert into employee values (1901,"Frank",10,2763);
+insert into employee values (2035,"Patrick",1,4583);
+insert into employee values (2405,"Lisa",7,4350);
+insert into employee values (2974,"Kimberly",11,2874);
+insert into employee values (3190,"Bonnie",11,3758);
+insert into employee values (3506,"Michael",9,1936);
+insert into employee values (3708,"Todd",22,4046);
+insert into employee values (4428,"Joe",22,3802);
+insert into employee values (5962,"Earl",11,2958);
+insert into employee values (6060,"Robert",22,4128);
+insert into employee values (6418,"Amy",2,4832);
+insert into employee values (7466,"Pamela",1,4199);
+insert into employee values (9102,"Maria",11,2958);
+insert into employee values (11863,"Joe",18,1721);
+insert into employee values (12004,"Linda",15,2306);
+insert into employee values (12387,"Melissa",20,1854);
+insert into employee values (13835,"Carol",20,4340);
+insert into employee values (15151,"Paula",15,1526);
+insert into employee values (15286,"Marilyn",10,3087);
+insert into employee values (15675,"Jennifer",2,2336);
+insert into employee values (16493,"Harry",14,4755);
+insert into employee values (17858,"David",13,3658);
+insert into employee values (19035,"Julia",4,2195);
+insert into employee values (19172,"Kevin",1,2113);
+insert into employee values (21638,"Paul",6,3120);
+insert into employee values (22684,"James",14,1370);
+insert into employee values (23621,"Kelly",7,1923);
+insert into employee values (24011,"Robin",22,1880);
+insert into employee values (24611,"Ralph",22,1495);
+insert into employee values (25109,"Gloria",2,1979);
+insert into employee values (25120,"Victor",20,1557);
+insert into employee values (28247,"David",23,2212);
+insert into employee values (30183,"Joyce",20,2748);
+insert into employee values (30712,"Donna",8,2604);
+insert into employee values (32502,"Michelle",1,2086);
+insert into employee values (32654,"Stephanie",17,1444);
+insert into employee values (33086,"Gerald",23,2206);
+insert into employee values (33132,"Walter",11,4180);
+insert into employee values (37008,"Christina",8,3100);
+insert into employee values (38246,"Brandon",3,4339);
+insert into employee values (38272,"Elizabeth",23,3967);
+insert into employee values (38964,"Joseph",4,2194);
+insert into employee values (39789,"Lawrence",9,1872);
+insert into employee values (40797,"Marilyn",15,2112);
+insert into employee values (41228,"Lori",13,4350);
+insert into employee values (44436,"Matthew",15,4673);
+insert into employee values (45285,"Jesse",1,3768);
+insert into employee values (47458,"John",13,3104);
+insert into employee values (47496,"Martha",15,4020);
+insert into employee values (47920,"Timothy",10,1745);
+insert into employee values (48129,"Christine",22,3738);
+insert into employee values (50664,"Anthony",22,4912);
+insert into employee values (51741,"Paula",1,2492);
+insert into employee values (52923,"Kimberly",17,1955);
+insert into employee values (55238,"Louise",1,2717);
+insert into employee values (56775,"Martin",16,1385);
+insert into employee values (57065,"Paul",23,3379);
+insert into employee values (58343,"Antonio",21,3268);
+insert into employee values (59256,"Jacqueline",14,3913);
+insert into employee values (60119,"Diana",13,5149);
+insert into employee values (61191,"Joh",5,1775);
+insert into employee values (65288,"Dorothy",22,3792);
+insert into employee values (65375,"Evelyn",6,4079);
+insert into employee values (66442,"Phillip",9,1894);
+insert into employee values (67137,"Evelyn",15,1311);
+insert into employee values (68942,"Debra",20,3704);
+insert into employee values (69085,"David",11,1845);
+insert into employee values (69234,"Jok",12,5088);
+insert into employee values (69475,"Brandon",19,2279);
+insert into employee values (69787,"Ann",9,1311);
+insert into employee values (70963,"Emily",8,5247);
+insert into employee values (71569,"Dorothy",22,4088);
+insert into employee values (72030,"Jonathan",4,5009);
+insert into employee values (72370,"Dorothy",18,3174);
+insert into employee values (72785,"Marilyn",1,1860);
+insert into employee values (72974,"Norma",21,1558);
+insert into employee values (74662,"Nancy",6,3223);
+insert into employee values (76876,"Andrew",11,1746);
+insert into employee values (77609,"Keith",2,1219);
+insert into employee values (78101,"Benjamin",7,4414);
+insert into employee values (79744,"Charles",11,1911);
+insert into employee values (80475,"Alan",16,1853);
+insert into employee values (80895,"Tammy",8,1591);
+insert into employee values (81381,"Anna",16,1569);
+insert into employee values (82828,"James",23,4398);
+insert into employee values (85287,"Robin",23,2078);
+insert into employee values (87170,"Jean",18,3895);
+insert into employee values (87355,"Andrew",15,1446);
+insert into employee values (89017,"Roy",8,3443);
+insert into employee values (90507,"Diana",9,5101);
+insert into employee values (90558,"Christina",23,3498);
+insert into employee values (92908,"Jesse",13,4753);
+insert into employee values (95322,"Joyce",18,1577);
+insert into employee values (95983,"Patricia",23,1469);
+insert into employee values (96963,"Gregory",16,5071);
+insert into employee values (97178,"Brian",19,3144);
+insert into employee values (98271,"Christine",3,3796);
+insert into employee values (98491,"Lillian",3,1920);
+insert into employee values (98493,"Nancy",22,4912);
+insert into employee values (98495,"Patricia",22,4912);
+insert into employee values (98497,"Angela",22,4912);
+insert into employee values (98499,"Gregory",22,4912);
+insert into employee values (99491,"Lillian",22,4912);
+insert into employee values (99493,"Evelyn",22,491);
+
+-- Greater than
+select * from employee where salary > 3100;
+
+-- Greater than equal to
+select * from employee where salary >= 3100;
+
+-- Less than
+select * from employee where salary < 4500;
+
+-- Less than equal to
+select * from employee where salary <= 4350;
+
+-- Range
+select * from employee where salary > 3000 and salary < 4000;
+
+select * from employee where salary between 3000 and 4000;
+
+-- Like Operator
+select * from employee where name like '%Jo%';          -- Similar to *Jo* in regrex
+
+select * from employee where name like 'Jo_';           -- Similar to Jo. in regrex