先看下面的例子:oracle中两个系统表.emp,dept. example: 1:not exists(not in) not exists: 这条语句返回select * from scott.dept d where e.deptno=d.deptno and d.deptno=10条件满足的结果集.也就是说, 返回的结果集中不存在d.deptno=10结果集的记录,即emp表中没有dept表中d.deptno=10的记录. SQ...
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Oracle SQL by Example 《Oracle SQL by Example》是Prentice Hall Ptr出版的图书，作者是Rischert, Alice
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(That is: if I understand correctly, you are not interested in solving the problem "by any means"; rather, you want to see how recursive queries work, in a small example so you can understand EVERYTHING that goes on.) with r ( empno, mgr ) as ( select empno, mgr -- ANCHOR leg ...
There are limitations to theIF NOT EXISTSclause. As demonstrated above, we can't prevent an error if we try to add a column to a table that is already present. The output of some older versions of tools is different to what was presented above in 23ai SQL*Plus. For example older vers...
Oracle PL/SQL by Example 《Oracle PL/SQL by Example》是Prentice Hall出版的图书，作者是Benjamin Rosenzweig，Elena Rakhimov
SELECT ENAME,HIREDATE FROM EMP WHERE DEPTNO=(SELECT DEPTNO FROM EMP WHERE ENAME='SCOTT');...