DELETE是 DML 类型的语句;TRUNCATE 是 DDL 类型的语句。它们都用来清空表中的数据。 DELETE 是逐行一条一条删除记录的;TRUNCATE 则是直接删除原来的表,再重新创建一个一模一样的新表,而不是逐行删除表中的数据,执行数据比 DELETE 快。因此需要删除表中全部的数据行时,尽量使用 TRUNCATE 语句, 可以缩短执行时间。
*/ CREATE TYPE LocationTableType AS TABLE ( LocationName VARCHAR(50) , CostRate INT ); GO /* Create a procedure to receive data for the table-valued parameter. */ CREATE PROCEDURE dbo. usp_InsertProductionLocation @TVP LocationTableType READONLY AS SET NOCOUNT ON ...
SQL Server数据库基础 SQL Server数据库基础 当创建了数据库之后,下一步就需要设计数据库对象。SQL Server能够创建多种数据库对象,如表、索引、视图、存储过程、游标、触发器等。本章将对其基础知识、相关的操作进行详细介绍。 本章主要内容: l表 l索引 l视图 l存储过程 l游标 l触发器 1表 本节我们介绍数据表...
UNBOUND_SQL_PARAMETER 42P06 重複的架構 SCHEMA_ALREADY_EXISTS 42P07 重複的數據表 DELTA_TABLE_ALREADY_EXISTS、TABLE_OR_VIEW_ALREADY_EXISTS、TEMP_TABLE_OR_VIEW_ALREADY_EXISTS、VIEW_ALREADY_EXISTS 42P08 模棱兩可的參數 CATALOG_NOT_FOUND 42P10 無效的數據行參考 CLUSTERING_COLUMNS_MISMATCH、DELTA_CLUSTERI...
Parameters are local to the function; the same parameter names can be used in other functions. Parameters can take the place only of constants; they can't be used instead of table names, column names, or the names of other database objects. ANSI_WARNINGS isn't honored when you pass ...
Parameters are local to the function; the same parameter names can be used in other functions. Parameters can take the place only of constants; they can't be used instead of table names, column names, or the names of other database objects. ANSI_WARNINGS isn't honored when you pass ...
Month & Year as parameter in SQL query? More columns name than defined...?! Problem in a view... Most efficient way: Checking for an invalid character in a database field Move Data from Temp TAble to Flat File move files from one location to another using xp_cmdshell Msg 102, Level ...
] {table_name | view_name | table_valued_function_name } | AS TYPE [ schema_name.]table_type_name | AS FOR XML } Syntax for In-Memory OLTP. syntaxsql Copy -- Execute a natively compiled, scalar user-defined function [ { EXEC | EXECUTE } ] { [ @return_status = ] { module...
Create an Oracle user named MIGRATIONS with default tablespace USERS and temporary tablespace TEMP; and grant it at least the RESOURCE role and the CREATE SESSION and CREATE VIEW privileges. (For multischema migrations, you must grant the RESOURCE role with the ADMIN option; and you must also ...
WHERE column = [[ {{ your_parameter }} --]] your_default_value The comment will “activate” whenever you pass a value to your_parameter.This is useful when defining complex default values (for example, if your default value is a function like CURRENT_DATE). Here’s a PostgreSQL ...