首先on commit preserve rows 和 on commit delete rows 都是在oracle 创建临时表时用到的, delete rows用于事务相关,也就在事务结束后truncate data in the temporary table. preserve rows表示在会话结束后清除临时表的数据 前者在事务提交后数据就已经清除了. 后者在会话中止时或者导常退出时数据都会被清除掉....
Class_Memo varchar2(200)) on Commit delete Rows ; 3) 两中类型临时表的区别 会话级临时表采用 on commit preserve rows ;而事务级则采用 on commit delete rows ;用法上,会话级别只有当会话结束临时表中的数据才会被截断,而且事务级临时表则不管是 commit 、 rollback 或者是会话结束,临时表中的数据都将被...
1. CHAR类型数组变量 EXEC SQL for :delete_rows delete FROM table_name WHERE a= :a; 由于char对应于Oracle的char类型,因此若有空格,则此时char即使用memset初始化,但也会带有后面的空格,有可能造成delete时where a=:a由于空格不匹配无法删除,例如:a赋值为'a’,但数组长度是3,因此实际where条件是a='a ',...
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester 8 rows selected. SQL> SQL> SQL> SQL> SQL> SQL> SQL> -- delete command with conditions SQL> SQL> delete from Employee where Salary > 3000; 4 rows deleted. SQL> SQL> select * from Employee; ID FIRST_NAME LAST_NAME START_D...
obclient>DELETEFROM(SELECT*FROMtbl1);Query OK,4rowsaffected obclient>SELECT*FROMtbl1;Emptyset 单表删除:包含RETURNING子句。 obclient>DELETEFROMtbl1RETURNINGcol1;+---+|COL1|+---+|1||2||3||4|+---+4rowsinsetobclient>SELECT*FROMt1;Emptyset SQL ...
652 rows deleted.Code language:SQL (Structured Query Language)(sql) D) Oracle DELETE – delete cascade In practice, you often delete a row from a table that has a foreign key relationship with rows from other tables. For example, you want to delete the sales order with id 1 from theorde...
499995 rows deleted. commit; 1. 2. 3. 4. 5. 6. 5、再查看空间使用情况 75% – 100% free space blocks从DELETE前的237 增长到 71665。 set serverout on exec show_space('TAB1','TEST'); SQL> SQL> Total Blocks...589824 Total Bytes...4831838208 Unused Blocks....
499995 rows deleted. commit; 5、再查看空间使用情况75% – % freespace blocks从DELETE前237 增长到 71665。 set serverout on exec show_space('TAB','TEST'); SQL> SQL> Total Blocks...589824 Total Bytes...4831838208 Unused Blocks...0 Unused Bytes...0 Last Used Ext FileId...23 Last...
Class_Memo varchar2(200)) on Commit delete Rows ; 3) 两中类型临时表的区别 会话级临时表采用 on commit preserve rows ;而事务级则采用 on commit delete rows ;用法上,会话级别只有当会话结束临时表中的数据才会被截断,而且事务级临时表则不管是 commit 、 rollback 或者是会话结束,临时表中的数据都将被...
obclient>DELETEFROM(SELECT*FROMtbl1);Query OK,4rowsaffected obclient>SELECT*FROMtbl1;Emptyset 单表删除:包含RETURNING子句。 obclient>DELETEFROMtbl1RETURNINGcol1;+---+|COL1|+---+|1||2||3||4|+---+4rowsinsetobclient>SELECT*FROMt1;Emptyset SQL ...