SQL Equality


Example

SELECT * FROM Employees 

This statement will return all the rows from the table Employees.

Id   FName     LName    PhoneNumber   ManagerId   DepartmentId    Salary  Hire_date     CreatedDate   ModifiedDate
1    James     Smith    1234567890    NULL        1               1000    01-01-2002    01-01-2002    01-01-2002
2    John      Johnson  2468101214    1           1               400     23-03-2005    23-03-2005    01-01-2002
3    Michael   Williams 1357911131    1           2               600     12-05-2009    12-05-2009    NULL
4    Johnathon Smith    1212121212    2           1               500     24-07-2016    24-07-2016    01-01-2002

Using a WHERE at the end of your SELECT statement allows you to limit the returned rows to a condition. In this case, where there is an exact match using the = sign:

SELECT * FROM Employees WHERE DepartmentId = 1

Will only return the rows where the DepartmentId is equal to 1:

Id   FName     LName    PhoneNumber   ManagerId   DepartmentId    Salary  Hire_date     CreatedDate   ModifiedDate
1    James     Smith    1234567890    NULL        1               1000    01-01-2002    01-01-2002    01-01-2002
2    John      Johnson  2468101214    1           1               400     23-03-2005    23-03-2005    01-01-2002
4    Johnathon Smith    1212121212    2           1               500     24-07-2016    24-07-2016    01-01-2002