SQL
From SkyWiki
(Difference between revisions)
(→ANSI joins in Oracle) |
Current revision (16:18, 3 October 2008) (view source) m (→ANSI joins in Oracle) |
||
| Line 21: | Line 21: | ||
from emp | from emp | ||
right outer join dept on emp.deptno = dept.deptno | right outer join dept on emp.deptno = dept.deptno | ||
| + | </source> | ||
| + | |||
| + | full join | ||
| + | <source lang=sql> | ||
| + | select ... | ||
| + | from emp | ||
| + | full join dept on emp.deptno = dept.deptno | ||
| + | </source> | ||
| + | |||
| + | cross join | ||
| + | <source lang=sql> | ||
| + | select ... | ||
| + | from emp | ||
| + | cross join dept | ||
</source> | </source> | ||
Current revision
ANSI joins in Oracle
Presentation about the ANSI syntax introduced in Oracle 9i
inner join
SELECT ... FROM emp JOIN dept ON emp.deptno = dept.deptno
left outer join
SELECT ... FROM emp LEFT OUTER JOIN dept ON emp.deptno = dept.deptno
right outer join
SELECT ... FROM emp RIGHT OUTER JOIN dept ON emp.deptno = dept.deptno
full join
SELECT ... FROM emp FULL JOIN dept ON emp.deptno = dept.deptno
cross join
SELECT ... FROM emp CROSS JOIN dept
traditional Oracle outer join syntax
inner join
SELECT ... FROM emp, dept WHERE emp.deptno = dept.deptno
left outer join
SELECT ... FROM emp, dept WHERE emp.deptno(+) = dept.deptno
right outer join
SELECT ... FROM emp, dept WHERE emp.deptno = dept.deptno(+)
TOP n SELECT
MySQL:
SELECT EMPNO, ENAME, JOB, MGR, SQL FROM EMP LIMIT 10 offset 20
Oracle >= 8.1.6:
SELECT * FROM (SELECT EMPNO, ENAME, JOB, MGR, SQL, rank() over(partition BY JOB ORDER BY HIRE_DATE DESC ) RN FROM EMP ) WHERE RN BETWEEN 20 AND 30 SELECT EMPNO, ENAME, JOB, MGR, SAL, rank() over (ORDER BY SAL DESC NULLS LAST) AS RANK, dense_rank() over (ORDER BY SAL DESC NULLS LAST) AS DRANK FROM EMP ORDER BY SAL DESC NULLS last;
MS SQL Server:
SELECT top 10 EMPNO, ENAME, JOB, MGR FROM EMP
Sybase:
SET rowcount 10 SELECT COLUMNS FROM TABLE
Firebird:
SELECT first 10 COLUMNS FROM TABLE
