Transact-SQL 語法慣例 語法 syntaxsql 複製 SELECT [ ALL | DISTINCT ] [ TOP ( expression ) [ PERCENT ] [ WITH TIES ] ] <select_list> <select_list> ::= { * | { table_name | view_name | table_alias }.* | { [ { table_name | view_name | table_alias }. ] { column_name ...
从数据库中检索行,并启用从 SQL Server 数据库引擎中的一个或多个表选择一个或多个行或列。 语句的完整语法SELECT很复杂,但主要子句可以按如下所示进行汇总: [ WITH { [ XMLNAMESPACES,] [common_table_expression] } ] ] SELECTselect_list[INTOnew_table] ...
SQL Server(三):Select语句 1、最基本的Select语句: Select [Top n [With Ties]] <*|Column_Name [As <Alias>][, ...n]> From <Table_name> Order by <Column_Name [DESC]>[, ...n] 1)*(星号)表示所有列,在选择特定列时可以在结果集中更改显示的列名 Select*fromProducts SelectProductID,Product...
SELECT fieldlist FROM table1 CROSS JOIN table2 例如,交叉联接课程和学生表,结果集的行数为两表行数的乘积。 联接多表 SELECT fieldlist FROM table1 , table2, table3... WHERE table1.column = table2.column and Table2.column = table3.column... 或 SELECT fieldlist FROM table1 JOIN table2 JO...
SQL 複製 USE AdventureWorks2022; GO IF OBJECT_ID('dbo.NewProducts', 'U') IS NOT NULL DROP TABLE dbo.NewProducts; GO ALTER DATABASE AdventureWorks2022 SET RECOVERY BULK_LOGGED; GO SELECT * INTO dbo.NewProducts FROM Production.Product WHERE ListPrice > $25 AND ListPrice < $100; GO ...
1.SQL Server的行号 A.SQL 2000使用identity(int,1,1)和临时表,可以显示行号 SELECT identity(int,1,1) AS ROWNUM, [DataID] INTO #1 FROM DATAS order by DataID; SELECT * FROM #1 B.SQL 2005提供一个很好用的函数row_number(), 可以直接用来显示行号,当然也可以使用SQL 2000的identity ...
CREATE TABLE #ProductPrices (ProductName varchar(25), SuperSalePriceMoney NULL, SalePrice Money NULL, ListPrice Money NULL) GO INSERT INTO #ProductPrices VALUES('Standard Widget', NULL, NULL,15.95) INSERT INTO #ProductPrices VALUES('Economy Widget', NULL, 9.95, 12.95) ...
[INTOnew_table_name] FROMtable_list [WHEREsearch_conditions] [GROUP BY [ALL]group_by_list] [HAVINGsearch_conditions] [ORDER BYorder_list[ASC | DESC] ] 1、select_list描述结果集的列。它是一个逗号分隔的表达式列表。每个表达式同时定义格式(数据类型和大小)和结果集列的数据来源。每个选择列表表达式通...
Then, you will need to check the TempDB tables list. For convenience, let’s do it using dbForge Studio for SQL Server: Note that there’s an error when trying to access the same table in SQL Server Management Studio. That happened because the temporary table is local to the session in...
在数据库中,使用最多的就是查询语句:SELECT 语句用于检索表中的数据。常用的查询语句格式如下: SELECT [DISTINCT] [TOP (n)] { * | select_list } FROM table_name | view_name WHERE search_condition [GROUP …