syntaxsql 复制 FROM { [ , ...n ] } ::= { [ database_name . [ schema_name ] . | schema_name . ] table_or_view_name [ AS ] table_or_view_alias [ <tablesample_clause> ] | derived_table [ AS ] table_alias [ ( column_alias [ , ...n ] ) ] | <joined_table> } ...
DELETE 谓词 谓词是布尔值 SQL 复制 DELETE t1 WHERE c1 > 10 DELETE TOP 表达式 表达式是整数或浮点数类型 SQL 复制 DELETE TOP 2 FROM t1 DECLARE 变量声明 初始值和数据类型兼容 SQL 复制 DECLARE @v INT = 10 EXECUTE 语句参数和返回类型 形参和实参 SQL 复制 CREATE PROCEDURE p1 (...
The syntax of the WAITFOR command is: Copy WAITFOR(<statement>) [,TIMEOUT ] Another T-SQL enhancement in Yukon allows you to return output from Data Manipulation Language (DML) statements other than SELECT (INSERT, UPDATE, DELETE). A new OUTPUT clause allows you to request that the...
syntaxsql Másolás FROM { [ , ...n ] } ::= { [ database_name . [ schema_name ] . | schema_name . ] table_or_view_name [ AS ] table_or_view_alias | derived_table [ AS ] table_alias [ ( column_alias [ , ...n ] ) ] | <joined_table> } <joined_table> ::...
Amazon Aurora MySQL-Compatible Edition (Aurora MySQL) doesn’t support DELETE and UPDATE FROM syntax. Migration Considerations You can easily rewrite the DELETE and UPDATE FROM statements as subqueries. For DELETE, place the subqueries in the WHERE clause. For U...
默认值只在INSERT语句中使用,即在UPDATE语句和DELETE语句中将被忽略。 如果在INSERT语句中提供了任意值,那么就不使用默认值。 如果没有提供值,那么就使用默认值。 对于默认值约束,有以下可以执行的操作: 在数据表定义时作为表的一部分同时被创建。 可以添加到已创建的表中。 可以删除DEFAULT定义。
SyntaxFollowing is the basic syntax of DROP TABLE statement −DROP TABLE table_name; Advertisement - This is a modal window. No compatible source was found for this media.ExampleLet us first verify CUSTOMERS table and then we will delete it from the database −...
syntaxsql 复制 sp_removedbreplication [ [ @dbname = ] N'dbname' ] [ , [ @type = ] N'type' ] [ ; ] 参数 [ @dbname = ] N'dbname' 数据库的名称。 @dbname为 sysname,默认值为 NULL. 使用当前数据库时 NULL。 [ @type = ] N'type' 要删除其数据库对象的复制类型。 @type为 nvarcha...
DELETE INSERT SELECT UPDATE MERGE Transact-SQL 语法约定 语法 syntaxsql 复制 <query_hint> ::= { { HASH | ORDER } GROUP | { CONCAT | HASH | MERGE } UNION | { LOOP | MERGE | HASH } JOIN | DISABLE_OPTIMIZED_PLAN_FORCING | EXPAND VIEWS | FAST <integer_value> | FORCE ORDER | { ...
SyntaxFollowing is the basic syntax of DISTINCT keyword to eliminate duplicate records.SELECT DISTINCT column1, column2,...columnN FROM table_name WHERE [condition] ExampleConsider the CUSTOMERS table having the following records.ID NAME AGE ADDRESS SALARY 1 Ramesh 32 Ahmedabad 2000.00 2 Khilan 25...