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Where condition in sql query in Queries of SQL Queries
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Hints 
Where condition used in the select statement.When you need to compare the column which has some values where condition used.

In following example, emp numbers are selected where the job column has value of clerk in work_on table.Can use "and","or" with where condition to check multiple columns values.
Syntax
select columnName from tableName where columnName ='value';
Example
Get the employee numbers for all clerks

select emp_no from Works_on where job='Clerk';
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