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In the development process, we will use some initialization statements, because of the foreign key relationship, we need to write some ID to die, then when we are initialized, we need to increment the table in MySQL from a certain value of the primary key.ALTER TABLE ' system_role_menu ' auto_increment = 11;The table above indicates that the System_role_menu tabl
Label:SQL inserts data into the table with the primary key self-increment 1. Building an Index --Create sequence
create sequence seq_new_old_mge
minvalue 1400
maxvalue 999999999999999999999999999
start with 1420
increment by 1
cache 20; Note: Create sequence seq_new_old_mge, Min. 1400, Max 999999999999999999 (I don't k
using the GUID master key:1, storage space is large (in bytes), so it will take up more disk size.2, difficult to remember. Join operation performance is lower than Int.3. There is no built-in function to get the newly generated GUID primary key.4. The GUID master key will be added to the other indexes on the table, t
-server data merging is very convenient.Disadvantages of using the GUID master key:1, storage space is large (in bytes), so it will take up more disk size.2, difficult to remember. Join operation performance is lower than Int.3. There is no built-in function to get the newly generated GUID primary key.4. The GUID maste
---- Set a non-primary key to clustered index [Step 4] to: http://king123654789.iteye.com/blog/1169191
1. View All indexes. Clustered indexes are created on the primary key by default.Sp_helpindex person
2. -- delete the primary key
A few days ago, when I upgraded the database of a communtiy server from SQL 2000 to SQL 2005, I encountered a strange problem and reported the following error:
Violation of primary key constraint 'pk _ cs_threads'. Cannot insert duplicate
Label:exenotseledropclass prerop CREATE TABLE create sequence --CREATE TABLE Bonus_benchmark_ VALUE---------------------------------------------------------------declare num number; Begin select COUNT (1) into NUM from user_tables WHERE table_name = UPPER (' Bonus_benchmark_value '); If Num>0 then execute immediate ' drop table Bonus_benchmark_value '; End If; end;/--------------------------------Table structure for bonus_benchmark_value------------------------------ CREATE TABLE bonus
A few days ago, when I upgraded the database of a Communtiy Server from SQL 2000 to SQL 2005, I encountered a strange problem and reported the following error:Violation of primary key constraint 'pk _ cs_threads'. Cannot insert duplicate
Starting with SQL 2012, Microsoft has made a cache mechanism to make insert auto increment faster.Although this mechanism is good, but also has the troublesome situation, if your SQL suddenly restart, then this cache losesThis time causes your SQL
In daily SQL Server development, identity columns of the Identity type are often used as the auto-increment numbers of a table structure. For exampleArticleNumber, record number, and so on. The reference of the Self-increasing ID column greatly facilitates the databaseProgramDevelopment, but sometimes this stubborn fie
What is the auto-increment field in SQL Server (like the serial number sequence in Oracle? How to use it?
1. Create Table Name (Field name [int] identity (1, 1) not null,...)
2. in SQL Server, All Integer columns can be defined a
Create PROCEDURE pro_test (@userName NVARCHAR ( -) ) as--Select* from[dbo]. [Table_2]--SELECT *From [dbo]. [Student] Beginbegin TRAN DECLARE @tempTable TABLE (tempid uniqueidentifier) DECLARE @tempId uniqueidentifier INSERT into tabl E_2 (UserName) OUTPUT Inserted.userid into @tempTable VALUES (@userName)--insert data into the first table SELECT @tempId=tempid from @tempTable--assign a value to the middle variable INSERT into dbo. Student (Stuname, Stuage, Stusex,stucode) VALUES ('Zhansan',Ten,'
For example, there are three fields: Table person, person, id (mysql database, primary key, non-auto-increment), and name and pswd. In the case of auto-increment, we usually process insertintoperson (name, pswd) values (# {name},
The number of records in the SQL server computing table, the current auto-increment value, and the occupied space are not SELECTTableNameobj. name, TotalRowsprt. rows, Identity_CurrentIDENT_CURRENT (obj. name), [SpaceUsed (KB)] SUM (alloc. used_pages) * 8FROMsys. objectsobjJOINsys. indexesidxonobj. object_idi
No SELECT
When you create this table, set the ID to type int, and then set the identity to Yes and the seed to 1 increments.If this table is already built, you can add a field called ID at the end, and then do the same as above, then save to add. (Be sure to set it up after saving)ALTER TABLE student Add ID int identity (up to)After saving a new column ID, in the table design to delete the primary key, the ID moved t
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