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wht is d/f b/w inner join and outer join ? d/f group by and order by having by ?
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Answer Posted / srinivasa yadav
INNER JOIN: ALL THE MATCHED ROWS FROM BOTH THE TABLES ARE
DISPLAYED IN THE RESULTANT TABLE.
OUTER JOIN: THERE ARE THREE TYPES OF OUTER JOIN
THEY ARE
1)LEFT OUTER JOIN
2)RIGHT OUTER JOIN
3)FULL OUTER JOIN
LEFT OUTER JOIN:- ALL THE MATCHED AND UNMATCHED ROWS FROM
BOTH TABLES FROM THE LEFT TABLE ARE DISPLAYED IN THE
RESULTANT TABLES
RIGHT OUTER JOIN:- ALL THE MATCHED AND UNMATCHED ROWS FROM
BOTH RIGHT TABLE ARE DISPLAYED IN THE RESULTANT TABLE.
FULL OUTER JOIN:- ALL THE MATCHED AND UNMATCHED ROWS FROM
BOTH THE TABLES ARE DISPLAYED IN THE RESULTANT TABLE.
GROUP BY CLAUSE:- IT IS USED ON GROUP OF DATA AND PROCESS AN
SQL QUERY.
ORDER BY:- IT IS USED TO SORT THE DATA IN ASCENDING OR
DESCENDING ORDER.
EX:- SELECT EMPID FROM EMP_TBL ORDER BY
DSC (OR) ORDER BY 1.
ORDER BY 1 i.e THE COLUMN NUMBER (EMPID)
HAVING BY:- IT IS USED FOR CONDITION CHECKING.
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