How to use SELECT Command in SQL



How to use Select in SQL


--====================================================
-- 1.  simple select :- to show table data.
--====================================================

desc XX_EMP

select * from XX_EMP

select EMPNO, ENAME, DEPTNO, SAL  from XX_EMP

desc XX_DEPT

--====================================================
--2. cartesian product , Table Alise   
--====================================================

select * from XX_EMP A, XX_DEPT B

--====================================================
--3.   Relation or join to skip Cartesian product
--====================================================

no of table n = 2
actual no of joins:- (n-1) = 2-1 = 1


select *
from XX_EMP A, XX_DEPT B
where A.DEPTNO = B.DEPTNO

--====================================================
--4. Column  AS
--====================================================

select EMPNO||' - '||ENAME AS "Imployee_Info"
from XX_EMP A, XX_DEPT B
where A.DEPTNO = B.DEPTNO
select A.EMPNO, A.ENAME, B.* from XX_EMP A, XX_DEPT B
where A.DEPTNO = B.DEPTNO

--====================================================
--5.  Show row number
--====================================================

select ROWNUM S_No , A.* from XX_EMP A


--====================================================
--6.  count(*) show total no of records
--====================================================

select COUNT(*) AS "No of Records" from XX_EMP

--====================================================
--7.  arithmatic opertaion in select
--====================================================

select EMPNO , ENAME,  sal, (( sal *10)/100) AS "Employee Convenience"
from XX_EMP A, XX_DEPT B
where A.DEPTNO = B.DEPTNO


--====================================================
--8.  Distinct  function use
--====================================================

select Distinct DEPTNO  from XX_EMP

select Distinct DEPTNO  from XX_DEPT


--====================================================
--9.  Same Column name use only Once Ex:- DEPTNO 
--====================================================

select * from XX_EMP A, XX_DEPT B
where A.DEPTNO = B.DEPTNO



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