But what happens if we want to search for a single underscore. In other words we want to make sure that the ‘_’ is to be treated as an underscore and not as a wildcard? This can be resolved in Oracle using the ESCAPE clause. SQL> r 1* select * from names where name like '%...
The Oracle LIKE condition allows wildcards to be used in the WHERE clause of a SELECT, INSERT, UPDATE, or DELETE statement. This allows you to perform pattern matching.Syntax The syntax for the LIKE condition in Oracle/PLSQL is: expression LIKE pattern [ ESCAPE 'escape_character' ] Parameter...
DECLARE v_name VARCHAR2(50) := 'O''Reilly'; BEGIN DBMS_OUTPUT.PUT_LINE(v_name); -- 输出: O'Reilly END; 在LIKE查询中处理特殊字符:使用 ESCAPE 子句来指定一个转义字符,以便在LIKE查询中搜索百分号、下划线等特殊字符。sql DECLARE v_search_string VARCHAR2(50) := '50%'; BEGIN FOR rec IN...
原因是oracle 的select 语句中 like 里的 ‘_’表示的是一个位置的占位符,%表示的是一连串位置的占位符。此时如果查询项里面自带有下划线就悲催了。 解决办法: 使用escape() 函数 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...
SQL 里ESCAPE的用法 SQL中escape的用法使用ESCAPE 关键字定义转义符。 在模式中,当转义符置于通配符之前时,该通配符就解释为普通字符。例如,要搜索在任意位置包含字符串 5% 的字符串: WHERE ColumnA LIKE '%5/%%' ESCAPE '/' 前后两个%作为通配符使用,中间的%经过ESC ESCAPE 转义符 公众号 字符串 二维码 ...
oracle--sql 原创 王景帅 2014-04-11 12:08:27 2116阅读 oracle查询特殊字符-escape 当表中有特殊字符时,可以使用escape进行查询,官方描述如下: The pattern can contain special pattern-matching characters: An underscore (_) in the pattern matches exactly one character (as opposed to one byte in a ...
SELECT product_id, discount_message FROM discounts WHERE discount_message LIKE '%25!%%' ESCAPE '!';Code language: SQL (Structured Query Language) (sql) Try it Output: Summary Use the Oracle LIKE operator to query data that matches a specified pattern. Use the % wildcard to match zero or...
WHERE ename LIKE '%A\_B%' ESCAPE '\' The ESCAPE option identifies the backslash (\) as the escape character. In the pattern, the escape character precedes the underscore (_). This causes Oracle to interpret the underscore literally, rather than as a special pattern matching character...
1.1.1 About Oracle External Tables 1.1.2 About the Access Drivers for Oracle Big Data SQL 1.1.3 About Smart Scan for HDFS 1.1.4 About Storage Indexes 1.1.5 About Predicate Push Down 1.1.6 About Oracle Big Data SQL Statistics 1.2 Installation 2 Using Oracle Big Data SQL for Data Access ...
The underscore is a specialSQLpattern match to a single character and should be escaped if you are in fact looking for an underscore character in the LIKE clause of a query. Just add the following after a LIKE statement: ESCAPE '_' ...