用于将一个列中的字符串值(带连字符)分隔并选择到不同列中的 MySQL 查询
为此,可以使用 SUBSTRING_INDEX()。让我们首先创建一个表 -
mysql> create table DemoTable1962 ( EmployeeInformation text ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些记录 -
mysql> insert into DemoTable1962 values('101-John-29'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1962 values('102-David-35'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1962 values('103-Chris-28'); Query OK, 1 row affected (0.00 sec)
使用 select 语句显示表中的所有记录 -
mysql> select * from DemoTable1962;
这会产生以下输出 -
+---------------------+ | EmployeeInformation | +---------------------+ | 101-John-29 | | 102-David-35 | | 103-Chris-28 | +---------------------+ 3 rows in set (0.00 sec)
以下是如何从一列中分隔和选择值到不同的列中的查询 -
mysql> select substring_index(EmployeeInformation, '-', 1) as EmployeeId, substring_index(substring_index(EmployeeInformation,'-',2),'-',-1) AS EmployeeName, substring_index(substring_index(EmployeeInformation,'-',-2),'-',-1) AS EmployeeAge from DemoTable1962;
这会产生以下输出 -
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 101 | John | 29 | | 102 | David | 35 | | 103 | Chris | 28 | +------------+--------------+-------------+ 3 rows in set (0.00 sec)
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