3.查看创建库的语句 show create database 库名; 4,查看当前所在位置库 select database(); 5. 切换库 use 库名; 6.删除库 drop database 库名; 创建表: 表的基本操作: 1 创建表: 【表名.frm(表结构) 表名.ibd(表数据) 存储引擎innodb】 create table 【if not exist】表名( 字段名 数据类型, ...
Unlike the majority of the other data types in SQL Server, you cannot use a table variable as an input or an output parameter. In fact, a table variable is scoped to the stored procedure, batch, or user-defined function just like any local variable you create with a DECLARE statement. T...
The column is computed from an expression that uses other columns in the same table. For example, a computed column can have the definition: cost AS price * qty. The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or...
CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE 數據表屬性和數據表選項 CREATE TABLE 使用 Hive 格式 CREATE TABLE CONSTRAINT CREATE TABLE 使用中 CREATE TABLE LIKE CREATE VIEW CREATE VOLUME DECLARE VARIABLE DROP CATALOG DROP CONNECTION DROP CREDENTIAL DROP DATABASE DROP FUNCTION 投遞...
USE AdventureWorksDW GO DECLARE @DimCustomer_test TABLE ( [CustomerKey] [int] , [FirstName] [nvarchar](50) ,[MiddleName] [nvarchar](50) ,[LastName] [nvarchar](50) ) —insert data to @DimCustomer_test INSERT @DimCustomer_test
mysql> use sakila; Database changed 无论何时调用mysql命令行工具,都可以指定要使用的用户名和数据库,如下所示: mysql -u root -p sakila; 这样就不用在登录之后再键入use sakila;使用数据库了。现在你已经建立了会话并指定了数据库,接下来就可以使用SQL语句并查看结果了。例如,如果你想知道当前日期和时间,可...
CREATE FUNCTION <Scalar_Function_Name, sysname, FunctionName> ( -- Add the parameters for the function here <@Param1, sysname, @p1> <Data_Type_For_Param1, , int> ) RETURNS <Function_Data_Type, ,int> AS BEGIN -- Declare the return variable here DECLARE <@ResultVar, sysname, @Result...
This is the primary key of the table.So, we need to mark id as the primary key.To do that, we use the special Field function from sqlmodel and set the argument primary_key=True:Python 3.10+ from sqlmodel import Field, SQLModel, create_engine class Hero(SQLModel, table=True): id: ...
USE tempdb GO IF OBJECT_ID('TEMPDB..#1') IS NOT NULL DROP TABLE dbo.#1 GO CREATE TABLE #1 ( ID INT , Nr NVARCHAR(50) NOT NULL, OperationTime DATETIME DEFAULT (GETDATE()), CONSTRAINT pk_#1_id PRIMARY KEY (ID) ) ALTER TABLE #1 ADD CONSTRAINT CK_#1_Nr CHECK(Nr BETWEEN '10001' ...
ITableVariableCreateTableVariable(stringname, ITableDataType dataType) 参数 name 类型:System. . :: . .String The name of the variable to create. dataType 类型:Microsoft.SqlServer.Management.SqlParser.Metadata. . :: . .ITableDataType