用於將一個列中的字串值(帶連字元)分隔並選擇到不同列中的 MySQL 查詢
為此,可以使用 SUBSTRING_INDEX()。讓我們首先建立一個表 -
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記錄 -
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 語句顯示錶中的所有記錄 -
mysql> select * from DemoTable1962;
這會產生以下輸出 -
+---------------------+ | EmployeeInformation | +---------------------+ | 101-John-29 | | 102-David-35 | | 103-Chris-28 | +---------------------+ 3 rows in set (0.00 sec)
以下是如何從一列中分隔和選擇值到不同的列中的查詢 -
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;
這會產生以下輸出 -
+------------+--------------+-------------+ | EmployeeId | EmployeeName | EmployeeAge | +------------+--------------+-------------+ | 101 | John | 29 | | 102 | David | 35 | | 103 | Chris | 28 | +------------+--------------+-------------+ 3 rows in set (0.00 sec)
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