一. ORACLE SQL PLUS 使用技巧:
----①查找重复记录:
| SELECT DRAWING,DSNO FROM EM5_PIPE_PREFAB
WHERE ROWID!=(SELECT MAX(ROWID) FROM EM5 _PIPE_PREFAB D WHERE EM5_PIPE_PREFAB.DRAWING=D.DRAWING AND EM5_PIPE_PREFAB.DSNO=D.DSNO); |
----删除重复记录:
| DELETE FROM EM5_PIPE_PREFAB
WHERE ROWID!=(SELECT MAX(ROWID) FROM EM5 _PIPE_PREFAB D WHERE EM5_PIPE_PREFAB.DRAWING=D.DRAWING AND EM5_PIPE_PREFAB.DSNO=D.DSNO); |
----② 快速编译所有视图
----当在把数据库倒入到新的服务器上后(数据库重建)，需要将视图重新编译一遍，因为该表空间视图到其它表空间的表的连接会出现问题，可以利用PL/SQL的语言特性，快速编译。
| SQL >SPOOL ON.SQL
SQL >SELECT ‘ALTER VIEW ‘||TNAME||’ COMPILE;’ FROM TAB; SQL >SPOOL OFF |
