CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS return_data_type [ WITH <function_option> [ , ...n ] ] [ AS ] BEGIN...
The CREATE FUNCTION (SQL scalar, table, or row) statement is used to define a user-defined SQL scalar, table, or row function. A scalar function returns a single value each time it is invoked, and is generally valid wherever an SQL expression is valid. A table function can be used in...
首先Procedure和Function 都支持输入参数与输出结果,但各有优劣: procedure 方便过程控制、Insert , Update 等操作,但返回结果集通常使用Cursor;Function 虽然能返回DataTable 数据集,但不支持DML 语句,Insert , Update 就会报错(其实有条件支持); 在经历了N次尝试,失败,尝试,失败。。。后,最终决定采用Function 来实现...
parameters can be specified. A function can have zero or more input parameters. There must be one entry in the list for each parameter that the function expects to receive. All the parameters for a function are input parameters and are nullable. For more information, seeDefining the parameters...
By default, SQL Server cannot execute CLR code. You can create, modify, and drop database objects that reference common language runtime modules; however, you cannot execute these references in SQL Server until you enable theclr enabled option. To enable this option, usesp_configure. ...
---Table structureforgrade---DROPTABLEIFEXISTS`grade`;CREATETABLE`grade`(`id`int(11)NOTNULLAUTO_INCREMENTCOMMENT'id',`sno`varchar(20)CHARACTERSETutf8COLLATEutf8_unicode_ciNULLDEFAULTNULLCOMMENT'学号',`courseName`varchar(20)CHARACTERSETutf8COLLATEutf8_unicode_ciNULLDEFAULTNULLCOMMENT'课程名',`grade`...
Here is the code, if you’d like to try it in your local database (it should work withPostgreSQL9.3): 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DROPTABLEIFEXISTSsales_table;CREATETEMPORARYTABLEsales_table(keyvarchar(6),customerIDvarchar(10),productIDvarchar(10),price float);INSERTIN...
sqlclient.CodeFirst.InstallHisql(); 目前流行的ORM框架如果需要动态的拼接查询语句,只能用原生的sql进行拼接,无法跨不同数据库执行。hisql推出新的语法一套语句可以在不同的数据库执行 传统ORM框架最大的弊端就是完全要依赖于实体用lambda表达式写查询语句,但最大的问题就是如果业务场景需要动态拼接条件时只能又切换...
If an object of the given name already exists in the specified database and schema context or the user has no permissions to create a function, an error is raised. IF NOT EXISTS If the optional IF NOT EXISTS is specified, then the statement creates the function if it does not already...
根据X/Open和SQL Access Group SQL CAE规范(1992)所进行的定义,SQLERROR返回SQLSTATE值。SQLSTATE值是包含五个字符的字符串,由2个字符的SQL错误类和3个字符的子类构成。五个字符包含数值或者大写字母, 代表各种错误或者警告条件的代码。成功的状态是由00000标识的。SQL