mysql> SELECT LTRIM(' barbar');
-> 'barbar'

mysql> SELECT RTRIM('barbar ');
-> 'barbar'

mysql> SELECT TRIM(' bar '); //默認(rèn)刪除前后空格
-> 'bar'
mysql> SELECT TRIM(LEADING '，' FROM '，，barxxx'); //刪除指定首字符 如'，‘
-> 'barxxx'
mysql> SELECT TRIM(BOTH '，' FROM '，，bar，，，'); //刪除指定首尾字符
-> 'bar'
mysql> SELECT TRIM(TRAILING '，' FROM 'barxxyz，，');
-> 'barxxyz'

mysql> UPDATE table SET `field`=TRIM(TRAILING ',' FROM `FIELD`) WHERE WHERE `FIELD` LIKE '%,';

UPDATE [!db.pre!]ecms_news_data_1 SET `newstext`=TRIM(TRAILING '