syntaxsql [WITH<common_table_expression>[ , ...n ] ]SELECT<select_criteria>[ ; ]<select_criteria>::=[TOP(top_expression) ] [ALL|DISTINCT] { * |column_name| expression } [ , ...n ] [FROM{table_source} [ , ...n ] ] [WHERE<search_condition>] [GROUPBY<group_by_clause>] [HA...
In order to write queries you need to know what tables and columns are available in your databases. When using SSMS (SQL Server Management Studio) you can simply expand the database’s tables folder to list all the tables found in your database. Once you find a table you would like to ...
union all --空行加进去 select null,null --补空行 from all_objects where rownum<=(select shumu from cnt);--使用all_objects行比较多 4.merge into合并资料 语法:(其中as可以省略) MERGE INTO table_name AS table_alias USING (table|view|sub_query) AS alias ON (join condition) WHEN MATCHED TH...
SQL USEAdventureWorks2022; GO IF OBJECT_ID('dbo.Gloves', 'U') IS NOT NULLDROPTABLEdbo.Gloves; GO-- Create Gloves table.SELECTProductModelID,NameINTOdbo.GlovesFROMProduction.ProductModelWHEREProductModelIDIN(3,4); GO-- Here is the simple union.USEAdventureWorks2022; GOSELECTProductModelID,Na...
sql SELECTe.*FROMDimEmployeeASeORDERBYLastName; This example returns all rows (noWHEREclause is specified) and a subset of the columns (FirstName,LastName,StartDate) from theDimEmployeetable in theAdventureWorksPDW2022database. The third column heading is renamed toFirstDay. ...
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 dbForge Studio for SQL Server. Check it out below. The temporary table will disappear when the session ends. In this case...
SQL Server DML(SELECT)常见用法(二) 1 引言 上篇讲到SQL Server中DML的基本使用方法,其中SELECT语句是最常用的语句,其功能强大,结构复杂,下面通过例子,具体介绍其使用方法。 2 SELECT查询语句 SELECT语句从数据表或视图中查找数据,SELECT语法归纳如下: [WITH<common_table_expression>]...
INTO new_table_name 指定使用结果集来创建新表。new_table_name 指定新表的名称。 FROM table_list 包含从中检索到结果集数据的表的列表。这些来源可以是: 运行SQL Server 的本地服务器中的基表。 本地SQL Server 实例中的视图。SQL Server 在内部将一个视图引用按照组成该视图的基表解析为多个引用。
如需詳細資訊,請參閱 CREATE TABLE 中的資料表資料分割選項小節。 SELECT 陳述式 SELECT 語句是 CTAS 與 CREATE TABLE 之間的基本差異。 WITHcommon_table_expression 指定稱為通用資料表運算式 (CTE) 的暫存具名結果集。 如需詳細資訊,請參閱WITH common_table_expression (Transact-SQL)。
SELECT INTONameSELECT INTO -- 从一个查询的结果中创建一个新表SynopsisSELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ]* | expression [ AS output_name ] [, ...]INTO [ TEMPORARY | TEMP ] [ TABLE ] new_table[ FROM from_item [, ...] ][ WHERE condition ][ GROUP BY ...