SQL
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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
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
