《MYSQL数据库mysql trim函数用法实例》要点:
本文介绍了MYSQL数据库mysql trim函数用法实例,希望对您有用。如果有疑问,可以联系我们。
导读:一,mysql去除左空格函数:ltrim(str) returns the string str with leading space characters removed.例子:
mysql> select lt...
一,mysql去除左空格函数:
ltrim(str)
returns the string str with leading space characters removed.MYSQL数据库
例子:
MYSQL数据库
mysql> select ltrim(' barbar');
-> 'barbar'
this function is multi-byte safe.
二,mysql去除右空格函数:
rtrim(str)
returns the string str with trailing space characters removed.MYSQL数据库
例子:
MYSQL数据库
mysql> select rtrim('barbar ');
-> 'barbar'MYSQL数据库
this function is multi-byte safe.MYSQL数据库
三,trim函数可以过滤指定的字符串:
完整格式:trim([{both | leading | trailing} [remstr] from] str)
简化格式:trim([remstr from] str)MYSQL数据库
returns the string str with all remstr prefixes or suffixes removed. if none of the specifiers both, leading, or trailing is given, both is assumed. remstr is optional and, if not specified, spaces are removed.MYSQL数据库
例子:
MYSQL数据库
mysql> select trim(' bar '); //默认删除前后空格
-> 'bar'
mysql> select trim(leading ',' from ',,barxxx'); //删除指定首字符 如’,‘
-> 'barxxx'
mysql> select trim(both ',' from ',,bar,,,'); //删除指定首尾字符
-> 'bar'
mysql> select trim(trailing ',' from 'barxxyz,,');
-> 'barxxyz'
mysql> select trim(' bar '); //默认删除前后空格
-> 'bar'
mysql> select trim(leading ',' from ',,barxxx'); //删除指定首字符 如’,‘
-> 'barxxx'
mysql> select trim(both ',' from ',,bar,,,'); //删除指定首尾字符
-> 'bar'
mysql> select trim(trailing ',' from 'barxxyz,,');
-> 'barxxyz'
mysql> update table set `field`=trim(trailing ',' from `field`) where where `field` like '%,';
this function is multi-byte safe.
mysql trim函数清除字段两边的空格:
MYSQL数据库
update zen_products setproducts_additional_image=trim(products_additional_image) where 子句
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