带有"&"符号的查询在 Oracle 中有效,但在 MySQL 中无效?
mysqlmysqli database
"&"符号在 Oracle 中有效。要在 MySQL 中使用它,请使用 @,如以下语法所示−
SET @yourVariableName1 = yourValue, @yourVariableName2 = yourValue, @yourVariableName3 =yourValue,.........N; insert into yourTableName values(@yourVariableName1,@yourVariableName2,@yourVariableName3,........N);
为了理解上述语法,让我们创建一个表。创建表的查询如下 −
mysql> create table Student_Information -> ( -> StudentId int, -> StudentName varchar(100), -> StudentAge int, -> StudentMarks int, -> StudentCountryName varchar(10) -> ); Query OK, 0 rows affected (0.75 sec)
这是以 @ 开头的值的查询。使用插入命令在表中插入一些记录。−
mysql> SET @Id = 10001, @Name = 'Carol', @Age =23 ,@Marks =89, @CountryName = 'US'; Query OK, 0 rows affected (0.00 sec) mysql> insert into Student_Information values(@Id, @Name, @Age ,@Marks, @CountryName); Query OK, 1 row affected (0.19 sec)
现在,您可以使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from Student_Information;
这是输出 −
+-----------+-------------+------------+--------------+--------------------+ | StudentId | StudentName | StudentAge | StudentMarks | StudentCountryName | +-----------+-------------+------------+--------------+--------------------+ | 10001 | Carol | 23 | 89 | US | +-----------+-------------+------------+--------------+--------------------+ 1 row in set (0.00 sec)