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在sql server create table as select這個產品中，有1篇Facebook貼文，粉絲數超過1萬的網紅91 敏捷開發之路，也在其Facebook貼文中提到， 有在使用 MS SQL server 的朋友，如果有需要找到 identity 跳號的資料，可以參考一下新的寫法，查詢成本省很大。 #長知識 【SQL Tips】之【了解為何identity會發生不連續號碼與快速找出那些號碼是跳號】20171224 **identity保證唯一，不保證連...

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91 敏捷開發之路 By 91 敏捷開發之路

2017-12-24 11:50:10 有 52 人按讚
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有在使用 MS SQL server 的朋友，如果有需要找到 identity 跳號的資料，可以參考一下新的寫法，查詢成本省很大。

#長知識

【SQL Tips】之【了解為何identity會發生不連續號碼與快速找出那些號碼是跳號】20171224

**identity保證唯一，不保證連續**
**使用SARG規則與SET BASED方式找出不連續號碼**
**最後那三種找出不連續的技巧，成本比如下
50%(SELF JOIN搭配NOT IN) : 32%(SELF JOIN搭配 OFFSET 函數) : 18%(LAG 函數) **

許多SQL Server開發人員經常會使用identity自動產生連續編號，然而該identity卻有一個特質是發生交易退回(rollback)則會產生跳號的狀況，以下的狀況就是identity碰到交易退回後所產生的跳號情況。

***
use tempdb
go

if object_id('tblNum') is not null
drop table tblNum
go

create table tblNum
(c1 int identity ,
c2 nvarchar(30) unique --防止重複
)
go

insert into tblNum(c2) values ('lewis1')
insert into tblNum(c2) values ('lewis2')
insert into tblNum(c2) values ('lewis3')
insert into tblNum(c2) values ('lewis3') --重複姓名就發生跳號
insert into tblNum(c2) values ('lewis5')
insert into tblNum(c2) values ('lewis5') --重複姓名就發生跳號
insert into tblNum(c2) values ('lewis5') --重複姓名就發生跳號
insert into tblNum(c2) values ('lewis8')
insert into tblNum(c2) values ('lewis9')
insert into tblNum(c2) values ('lewis10')
go

select * from tblNum
GO

--結果
c1 c2
1 lewis1
2 lewis2
3 lewis3
5 lewis5 <--發生跳號
8 lewis8 <--發生跳號
9 lewis9
10 lewis10
***

基本上單一執行INSERT UPDATE DELETE 就是一種隱性交易，上述的範例就是因為條件約束(constraint)的unique緣故，當輸入的文字發生重複的時候，就會自動退回交易，緊接著identity也隨之發生跳號的狀況。

當瞭解identity會有發生跳號的特質之後，接下來分享三種從SQL Server 2005開始使用的抓取跳號的範例，以及從SQL Server 2012開始支援的Windows Offset函數抓取跳號的技巧。這三種技巧都是使用set-based的方式，不使用WHILE迴圈去比對資料的連續性，值得一試。

**從SQL Server 2005支援的抓取跳號的技巧
--使用自我查詢產生搭配CTE
--使用SET BASED技巧取代迴圈處理

WITH DS AS (
SELECT DS1.* FROM tblNum as DS1 JOIN
tblNum as DS2
on DS1.c1 = DS2.c1+1 )
SELECT * FROM tblNum
WHERE c1 NOT IN (SELECT TOP(1) c1 FROM tblNum ORDER BY c1)
EXCEPT
SELECT * FROM DS
GO

**從SQL Server 2012支援的抓取跳號的技巧
--使用自我查詢產生搭配OFFSET
--使用SET BASED技巧取代迴圈處理
WITH DS AS (
SELECT DS1.* FROM tblNum as DS1 JOIN
tblNum as DS2
on DS1.c1 = DS2.c1+1 ),
DS2 AS (SELECT * FROM tblNum ORDER BY 1 OFFSET 1 ROW )
SELECT * FROM DS2
EXCEPT
SELECT * FROM DS
GO

**從SQL Server 2012支援的抓取跳號的技巧
--使用自我查詢產生搭配LAG的Windows Offset技巧
--使用SET BASED技巧取代迴圈處理
WITH DIFF AS (
select *,LAG(c1, 1,0) OVER ( ORDER BY c1) as previous
,c1 - LAG(c1, 1,0) OVER ( ORDER BY c1) as diff
from tblNum
)
SELECT c1,c2 FROM DIFF WHERE diff>1
GO

--結果就是 5/8 之前就發生跳號
c1 c2
5 lewis5
8 lewis8

最後那三種找出不連續的技巧，成本比如下
50%(SELF JOIN搭配NOT IN) : 32%(SELF JOIN搭配 OFFSET) : 18%(LAG)

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The following SQL demonstrates how SQLite uses column affinity to do type conversions when values are inserted into a table. CREATE TABLE ...

#86. Sql where column name equals. (column1, columnn 2) IN ...

In SQL Server, you can use the query provided below to get the list of columns in a given table: SELECT COLUMN_NAME. This can be found within the Database ...

#87. 50 SQL Query Questions You Should Practice for Interview

That's why we've selected a set of 50 SQL queries that you can use to step up your learning. ... So, you can use them to create a test database and tables.

#88. SQL Interview Questions CHEAT SHEET (2022) - InterviewBit

On the contrary, MySQL is a relational database management system, like SQL Server, Oracle or IBM DB2, that is used to manage SQL databases. 6. What are Tables ...

#89. Sqlite inner join multiple columns. Furthermore, you can find ...

The WHERE clause places conditions on the selected columns, whereas the ... SQLite , much like SQL Server, has robust support for joining tables in a query.

#90. Database: Getting Started - Laravel - The PHP Framework For ...

To use a Microsoft SQL Server database, you should ensure that you have the sqlsrv and ... DB::unprepared('create table a (col varchar(1) null)');.

#91. SQLserverで create table XXX' as select * XXX | 今日の業務日報

このとき①でtempを作るときに使うクエリは create table XXX' as select * XXX ですが、 SQLserverは as がないようで、使えませんでした。

#92. Raw Sql Query To Django Converter With Code Examples

The following paragraphs will examine the various other potential solutions. select UID from User_master where email='[email protected]' CREATE TABLE ...

#93. How to connect react js with sql server database. The only ...

Create an index. Use something like the Slim Configure the connection in the resulting dialog: Name your connection, select Microsoft SQL Server as the ...

#94. Sql query with dynamic column name in where clause. To ...

To select records from my MySQL table using a column name , we only need to ... the tables in an external database (such as an Oracle, Sybase, or SQL Server ...

#95. What is a pivot column. Conventionally ... - Alpha Pro Academy

SQL Server PIVOT operator rotates a table-valued expression. ... and simple task: drag-and-drop tables, select columns, create JOINS, and set up filtering, ...

#96. SQL (Relational) Databases - FastAPI

PostgreSQL; MySQL; SQLite; Oracle; Microsoft SQL Server, etc. ... With an ORM, you normally create a class that represents a table in a SQL database, ...