將SEQUENCE 循環會從最小值或最大值重新開始,而不是從開始值重新開始。 [CACHE[<constant> ] | NO CACHE ] 藉由減少產生序號所需的磁碟 IO 數目,對使用順序物件的應用程式提升效能。 預設為 CACHE。 例如,如果所選擇的快取大小為 50,SQL Server 並不會保留 50 個個別的快取值。 它只快取目前值和留...
有关同时使用CREATE SEQUENCE和NEXT VALUE FOR函数的信息,请参阅序列号。 Transact-SQL 语法约定 语法 syntaxsql CREATESEQUENCE[schema_name. ]sequence_name[AS[built_in_integer_type| user-defined_integer_type] ] [STARTWITH<constant>] [INCREMENTBY<constant>] [ {MINVALUE[<constant>] } | {NOMINVALUE...
--1. 使用序列 (Sequence) https://docs.microsoft.com/zh-cn/sql/t-sql/statements/create-sequence-transact-sql?view=sql-server-ver15 --2. 为SQL Server 注册启动参数 -t272 IF EXISTS(SELECT*FROMsys.sequencesWHEREname= N'Id_Sequence') DROPSEQUENCEId_Sequence; GO CREATESEQUENCEId_Sequence ASINT ...
Informationen und Szenarien, in denen die CREATE SEQUENCE -Funktion und die NEXT VALUE FOR -Funktion verwendet werden, finden Sie unter Sequenznummern.Transact-SQL-SyntaxkonventionenSyntaxsyntaxsql Kopie CREATE SEQUENCE [schema_name . ] sequence_name [ AS [ built_in_integer_type | user-defined...
Бележка To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.Argumentssequence_name Specifies the unique name by which the sequence is known in the database. Type is sysname....
cache size of 50 is chosen, SQL Server does not keep 50 individual values cached. It only caches the current value and the number of values left in the cache. This means that the amount of memory required to store the cache is always two instances of the data type of the sequence ...
syntaxsql CREATESEQUENCE[schema_name. ]sequence_name[AS[built_in_integer_type| user-defined_integer_type] ] [STARTWITH<constant>] [INCREMENTBY<constant>] [ {MINVALUE[<constant>] } | {NOMINVALUE} ] [ {MAXVALUE[<constant>] } | {NOMAXVALUE} ] [CYCLE| {NOCYCLE} ] [ {CACHE[<constant...
1、预编译SQL的用法# 以MySQL 为例,在 MySQL 中,所谓预编译其实是指先提交带占位符的 SQL 模板,然后为其指定一个 key,MySQL 先将其编译好,然后用户再拿着 key 和占位符对应的参数让 MySQL 去执行,用法有点像 python 中的 format 函数。 一个标准的预编译 SQL 的用法如下: ...
向当前数据库里增加一个新的序列。序列的Owner为创建此序列的用户。SEQUENCE是一个存放等差数列的特殊表,该表受DBMS控制。这个表没有实际意义,通常用于为行或者表生成唯一的标识符。如果给出一个模式名,则该序列就在给定的模式中创建,否则会在当前模式中创建。序列名必
The CREATE SEQUENCE statement creates a sequence at the current server. Invocation This statement can be embedded in an application program or issued interactively. It is an executable statement that can be dynamically prepared only if DYNAMICRULES run behavior is implicitly or explicitly specified. ...