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mysql字符串截取

2012-10-25 12:35 274 查看

1. substring_index

substring_index(str,delim,count)

mysql> select substring_index('a-b-c-d','-',-1);
+-----------------------------------+
| substring_index('a-b-c-d','-',-1) |
+-----------------------------------+
| d                                 |
+-----------------------------------+
1 row in set (0.00 sec)

mysql> select substring_index('a-b-c-d','-',1);
+----------------------------------+
| substring_index('a-b-c-d','-',1) |
+----------------------------------+
| a                                |
+----------------------------------+
1 row in set (0.00 sec)

2. SUBSTRING
SUBSTRING(str,pos,len)

SUBSTRING(str FROM pos FOR len)

SUBSTRING(str,pos)

SUBSTRING(str FROM pos)

mysql> select substring((substring_index('a-b-c-d','-',2)),2);
+-------------------------------------------------+
| substring((substring_index('a-b-c-d','-',2)),2) |
+-------------------------------------------------+
| -b                                              |
+-------------------------------------------------+
1 row in set (0.01 sec)

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