SELECT * FROM dbo.Customers AS c WITH (SNAPSHOT) LEFT OUTER JOIN dbo.[Order History] AS oh ON c.customer_id = oh.customer_id; SPATIAL_WINDOW_MAX_CELLS = <integer_value> 適用於:SQL Server 2012 (11.x) 和更新版本 指定要用於
SQL_OJ_NOT_ORDERED = The column names in the ON clause of the outer join do not have to be in the same order as their respective table names in the OUTER JOIN clause.SQL_OJ_INNER = The inner table (the right table in a left outer join or the left table in a right outer join)...
T1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 ON boolean_expressionT1 { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 USING ( join column list )T1 NATURAL { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2 INNER和OUTER对所有连接形式都是可选的。
USE [master] GO CREATE DATABASE [MySchool] GO USE [MySchool] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE procedure [dbo].[CourseExtInfo] @CourseId int as select c.CourseID,c.Title,c.Credits,d.Name as DepartmentName from Course as c left outer join Department as d on...
The SQL Server setting SET ANSI_NULLS OFF changes this behavior. Testing for null: is [not] null The SQL predicate is [not] null tests whether the result of an expression is null or not. <expression> is null This returns true if the value of expression is null, and false otherwise. ...
USE[master]GOCREATEDATABASE[MySchool]GOUSE[MySchool]GOSETANSI_NULLSONGOSETQUOTED_IDENTIFIERONGOCREATEprocedure[dbo].[CourseExtInfo] @CourseIdintasselectc.CourseID,c.Title,c.Credits,d.NameasDepartmentNamefromCourseascleftouterjoinDepartmentasdonc.DepartmentID=d.DepartmentIDwherec.CourseID=@CourseIdGOS...
left 保留(可以是函数或类 保留 保留 型) length - 非保留 非保留 less 保留 保留 - level 非保留 保留 保留 like 保留(可以是函数或类 保留 保留 型) limit 保留 保留 - listen 非保留 - - load 非保留 - - local 非保留 保留 保留 localtime 保留 保留 - localtimestamp 保留 保留 - location 非...
Example 3-12 Using SQL Outer Joins -- the following uses a LEFT OUTER JOIN -- all rows are retrieved from the left table (employees) even if -- there is no match in the right table (departments) SELECTe.employee_id,e.last_name,e.department_id,d.department_name ...
How to optimize left outer join and how to decide indexes on the left outer join query ? please provide example of it. How to optimize Update query for 10 Million Records in SQL how to outer join 3 tables How to output/print in Triggers how to pad left and right in sql select statem...
SQL Server Subquery with 'select top 1' returning only NULL values despite table field having no ...