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SQL Server 和 Azure SQL Database 中有擴充事件的系統檢視表。 了解如何以不同的檢視方塊來表示事件工作階段資訊。
①sql drop database 数据库名;②sql drop database if exists 数据库名; 存在数据库再删除 //如果数据库存在,删除数据库 drop database if exists student; 1. 2. 创建表 create table 表名 ( 列名 数据类型 [约束], 列名 数据类型 [约束], 列名 数据类型 [约束] ... ); 1. 2. 3. 4. 5. 6...
Transact-SQL 語法慣例 語法 SQL Server 和 Azure SQL Database 的語法: syntaxsql <SELECT statement>::=[WITH{ [XMLNAMESPACES, ] [<common_table_expression>[ , ...n ] ] } ]<query_expression>[ORDERBY<order_by_expression>] [<FOR Clause>] [OPTION(<query_hint>[ , ...n ] ) ]<query_exp...
SELECT name FROM sys.databases WHERE name = N'TutorialDB' ) CREATE DATABASE [TutorialDB] GO USE [TutorialDB] -- Create a new table called 'Customers' in schema 'dbo' -- Drop the table if it already exists IF OBJECT_ID('dbo.Customers', 'U') IS NOT NULL ...
㈢模糊查询:like, rlike ㈣范围查询:in,not in,between…and,not between…and 空判断 排序:order_by 聚合函数:count(), max(), min(), sum(), avg(), round() 分组:group_by, group_concat():查询内容, having 分页: limit 连接查询 :inner join, left join, right join ...
database="数据库名" ) 查询数据库中的下拉列表选项 cursor = conn.cursor() sql = "SELECT * FROM 表名" cursor.execute(sql) results = cursor.fetchall() 在前端页面展示下拉列表选项 for row in results: 代码语言:txt 复制 print("<option value='" + row[0] + "'>" + row[1] + ...
SQL Tutorial: Learn SQL from Scratch Intoduction to SQL Features of SQL How to Download and Install SQL Server on Windows for Free? What is RDBMS? Relational Database Management System Explained ACID Properties & Normalization in SQL Create a Database in SQL in Minutes ...
SQL USEAdventureWorks2022; GO IF OBJECT_ID('dbo.NewProducts', 'U') IS NOT NULLDROPTABLEdbo.NewProducts; GOALTERDATABASEAdventureWorks2022SETRECOVERYBULK_LOGGED; GOSELECT*INTOdbo.NewProductsFROMProduction.ProductWHEREListPrice > $25ANDListPrice < $100; GOALTERDATABASEAdventureWorks2022SETRECOVERYFULL;...
There is already an object named '#temp' in the database. 在使用select into前,可以先做一下判断: ifOBJECT_ID('tempdb..#temp')isnotnulldroptable#tempselect*into#tempfromsysobjectsselect*from#temp 3. 利用select into生成一个空表 如果要生成一个空的表结构,不包含任何数据,可以给定一个恒不等式如...