The result of a parse operation is a parent cursor and a child cursor stored in the library cache.
The key information related to a parent cursor is the text of a SQL statement.
Therefore,
several SQL statements share the same parent cursor if their text is exactly the same
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select deptno,job,avg(sal),max(sal) from emp group by rollup( deptno,job);
緇熻絎竴涓淮搴︾殑鐨勬誨拰銆?br />
select deptno,job,avg(sal),max(sal) from emp group by cube( deptno,job);
鍦ㄧ粺璁＄涓涓淮搴︾殑鍩虹涓婏紝鍦ㄧ粺璁＄浜屼釜緇村害绔栧垪鐨勭患鍚堛?br />
select deptno,job,avg(sal),max(sal) ,grouping(deptno),grouping(job) from emp group by cube( deptno,job);
紜畾緇熻緇撴灉鏄惁鐢ㄥ埌浜嗙壒瀹氱殑鍒椼?br />
select deptno,job,avg(sal),max(sal) from emp group by GROUPING SETS( deptno,job);
鏄劇ず澶氱鍒嗙粍緇熻鐨勭粨鏋溿?/p>
浣跨敤default 鎻掑叆鏁版嵁錛屽湪values褰撲腑浣跨敤default浼氭彃鍏ラ粯璁ゅ鹼紝鎴栬匩ULL
2銆佷嬌鐢ㄥ瓧鏌ヨ鎻掑叆鏁版嵁銆?br /> INSERT INTO <TABLE> subquery.
INSERT ALL insert_into_clause [value clause]subquery
INSERT conditional_insert_clause subquery
insert all
when deptno = 10 then into dept10
when deptno = 20 then into dept20
else into others
select * from emp;
INSERT FIRST(濡傛灉鍏堝墠鐨勬暟鎹凡緇忚浣跨敤榪囷紝閭ｄ箞鍦ㄥ悗緇綋涓垯涓嶄細鍐嶄嬌鐢ㄨ繖浜涙暟鎹?
when deptno = 10 then into dept10
when deptno = 20 then into dept20
else into others
select * from emp;
鍙﹀鎻愪緵create table as subquery;
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榪樻病鏈変笅杞戒笅鏉ョ湅錛屽ぇ瀹跺彲浠ュ厛鍙傝冨弬鑰?img src ="http://www.tkk7.com/MagicStone/aggbug/84935.html" width = "1" height = "1" />
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