Retrieving Data from Table :-
- “Select “command is used to retrieve data from table.
- “Select” command is used to the following operations.
(i) Select
(ii) Project
(iii) Join
(iv) Set operations -> union, intersect
These operations are data retrieval operations.
SELECT :-
- Selecting particular records from Table.
Example :- sal>200
Project :
- Selecting particular columns from table
Example: – enameπ, sal(emp)
JOIN
- Greeting data from multiple tables.
Syntax:
Select<collist>
From<tabname>
Example : Display ename and salaries
Select ename, sal from emp
- Display all the data from emp table
Select * from EMP
- By default Sql server doesn’t column headings for derived columns
Select ename, sal, sal*12 From emp
Ename sal no column name
A 500 6000
B 600 7200
C 700 8400