如何在 MySQL 中选择一行,其中多列中的某一列等于某个特定值?
为此,你可以使用多个 OR。让我们首先创建一个表 -
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(10), LastName varchar(10), Age int, CountryName varchar(10) ); Query OK, 0 rows affected (0.58 sec)
使用 insert 命令向表中插入一些记录 -
mysql> insert into DemoTable(FirstName,LastName,Age,CountryName) values('John','Smith',21,'US'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(FirstName,LastName,Age,CountryName) values('Carol','Taylor',22,'AUS'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(FirstName,LastName,Age,CountryName) values('David','Miller',19,'UK'); Query OK, 1 row affected (0.16 sec)
使用 select 语句从表中显示所有记录 -
mysql> select *from DemoTable;
输出
+----+-----------+----------+------+-------------+ | Id | FirstName | LastName | Age | CountryName | +----+-----------+----------+------+-------------+ | 1 | John | Smith | 21 | US | | 2 | Carol | Taylor | 22 | AUS | | 3 | David | Miller | 19 | UK | +----+-----------+----------+------+-------------+ 3 rows in set (0.00 sec)
以下是选择一行(其中多列中的某一列等于某个特定值)的查询 -
mysql> select *from DemoTable where FirstName="Carol" OR Age=22 OR CountryName="AUS";
输出
+----+-----------+----------+------+-------------+ | Id | FirstName | LastName | Age | CountryName | +----+-----------+----------+------+-------------+ | 2 | Carol | Taylor | 22 | AUS | +----+-----------+----------+------+-------------+ 1 row in set (0.00 sec)
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