Home Database Mysql Tutorial #ORACLE 每日一点# ESCAPE用法

#ORACLE 每日一点# ESCAPE用法

Jun 07, 2016 pm 03:26 PM
esc escape effect usage

作用:escape关键字经常用于使某些特殊字符,如通配符:'%','_'转义为它们原来的字符的意义, 被定义的转义字符通常使用'\',但是也可以使用其他的符号(字母数字也可)。 SQL SELECT * FROM emp WHERE ename LIKE 'a%%' ESCAPE 'a'; EMPNO ENAME JOB MGR HIR

作用:escape关键字经常用于使某些特殊字符,如通配符:'%','_'转义为它们原来的字符的意义,

           被定义的转义字符通常使用'\',但是也可以使用其他的符号(字母数字也可)。

 

SQL> SELECT *  FROM emp WHERE ename LIKE 'a%%' ESCAPE  'a';
 
EMPNO ENAME JOB    MGR HIREDATE       SAL      COMM DEPTNO
----- ---------- --------- ----- ----------- --------- --------- ------
 7935 %CC  CLERK  7782 7/11/2012   1200.00               20

 

ESCAPE 'a' 将通配符%转义字符

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