使用 MySQL CONCAT 將特定列值與相應記錄合併
首先,我們建立一個表 -
mysql> create table DemoTable ( FirstName varchar(100), CountryName varchar(100) ); Query OK, 0 rows affected (0.56 sec)
使用 insert 命令在表中插入一些記錄 -
mysql> insert into DemoTable values('Adam','US'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David','AUS'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris','UK'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('John','US'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('Carol','AUS'); Query OK, 1 row affected (0.14 sec)
使用 select 語句顯示錶中的所有記錄 -
mysql> select *from DemoTable;
這將生成以下輸出 -
+-----------+-------------+ | FirstName | CountryName | +-----------+-------------+ | Adam | US | | David | AUS | | Chris | UK | | John | US | | Carol | AUS | +-----------+-------------+ 5 rows in set (0.00 sec)
以下是對特定列值與相應記錄進行合併的查詢 -
mysql> select concat(FirstName,' ',CountryName) AS NameWithCountry from DemoTable having NameWithCountry LIKE '%John%';
這將生成以下輸出 -
+-----------------+ | NameWithCountry | +-----------------+ | John US | +-----------------+ 1 row in set (0.00 sec)
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