Transact-SQL 語法慣例 Syntax 下列是 SQL Server 和 Azure SQL Database 的語法: syntaxsql DECLARE{ { @local_variable[AS]data_type[ = value ] } | { @cursor_variable_nameCURSOR} } [ ,...n ] | { @table_variable_name[AS]}::=TABLE( {<column_definition>||} } [ ,......
variable定义的变量即绑定变量,一般用于存储过程有out类型的参数时。定义时需要定于变量的数据数据类型,支持的数据类型如下。同define一样,只在当前会话中有效。 SQL> help variable VARIABLE --- Declares a bind variable that can be referenced in PL/SQL, or lists the current display characteristics for a s...
这个语句可以让我们在数据库中存储和操作数据时更加灵活和高效。 ##DECLARE的语法 在MySQL中,DECLARE语句的语法如下: ```sqlDECLAREvariable_name datatype [DEFAULT value]; ``` 其中, MySQL Server 存储过程 原创 mob64ca12dfd1d5 2024-04-10 06:18:45...
variable定义的变量即绑定变量,一般用于存储过程有out类型的参数时。定义时需要定于变量的数据数据类型,支持的数据类型如下。同define一样,只在当前会话中有效。 SQL> help variable VARIABLE --- Declares a bind variable that can be referenced in PL/SQL, or lists the current display characteristics for a s...
For more information about CLR user-defined types or alias data types, see CREATE TYPE (Transact-SQL).= value Assigns a value to the variable in-line. The value can be a constant or an expression, but it must either match the variable declaration type or be implicitly convertible to that...
For more information about CLR user-defined types or alias data types, see CREATE TYPE (Transact-SQL).= value Assigns a value to the variable in-line. The value can be a constant or an expression, but it must either match the variable declaration type or be implicitly convertible to that...
For more information about system data types, seeData Types (Transact-SQL). For more information about CLR user-defined types or alias data types, seeCREATE TYPE (Transact-SQL). =value Assigns a value to the variable in-line. The value can be a constant or an expression, but it must ei...
In SQL Server 2012, you can set a variable’s initial value at the same time you declare it. For example, the following line of code declares a variable named@ctrof typeintand sets its value to100: DECLARE @ctr int = 100 Previously, this functionality was possible only with stored proce...
cust_name customer.cust_fname%type; loc locations.location_name%type; book_date booking.booking_date%type; BEGIN FOR rec IN ( SELECT (customer.cust_fname || ', ' || customer.cust_sname) AS name, locations.location_name AS location, ...
{error-number | SQLSTATE error-string | condition} SQL statement 上述定义包括: Handler Type (CONTINUE,EXIT)//处理类型 继续或退出 Handler condition (SQLSTATE,MYSQL ERROR,CONDITION)//触发条件 Handler actions(错误触发的操作) 注意: 1、exit只退出当前的block。exit 意思是当动作成功提交后,退出所在的复...