Comments are used to prevent execution of SQL statements.
There are two Types of Comments
1) Single-Line Comment:
This is used to prevent execution of Single line.
It starts with “--” .
Example :
SELECT E.NAME,
--E.Salary AS EmpSalary,
D.Department AS DepartmentName FROM Employee E , DEPARTMENT D
WHERE E.DepartmentID=D.Id
2) Multi-Line Comment:
This is used to prevent execution of Multiple line.
It starts with /* and end with */.
Example :
SELECT
/*E.NAME,
E.Salary AS EmpSalary,*/
D.Department AS DepartmentName FROM Employee E , DEPARTMENT D
WHERE E.DepartmentID=D.Id
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