sql primary key autoincrement

SQL primary key constraints and foreign key constraints, SQL primary key constraintsPrimary key constraint

columns, change the column's order, index name, aggregation options, or fill factor for the PRIMARY key constraint. However, you cannot change the length of the column defined using the PRIMARY KEY constraint. Attention:To modify a PRIMARY

');View field information for a tableDESC table name; Show columns from table name;View all information for a tableShow create table table name;Add a PRIMARY KEY constraintALTER TABLE name add constraint primary Key name (Shape: Pk_ table name) primary

Tags: style http color io strong for AR artAdd a table fieldALTER TABLE table1 add transactor varchar (ten) not Null;ALTER TABLE table1 add ID int unsigned not Null auto_increment primary keyModify the field type of a table and specify empty or non-emptyALTER TABLE name change field Name field Name field type [whether non-null allowed];ALTER TABLE name modify field Name field type [allow non-null];ALTER TABLE name modify field Name field type [allow n

SQL: the primary key of a data table is of the varchar type and does not increase itself. how can I insert a primary key when inserting data? SQL: the primary

The last one we said about self-draining if the primary key is 0, here I figure out why, cause this is because the initial value is set in SQL for the self-row:　　From here you can see that the two variables, one is the increment of the initial value, one is incremental, here is 1, so when the setting of self-increment will be that field of the original existence

Tags: primary key first break range Ror add comment art DropSQL PRIMARY KEY ConstraintThe PRIMARY KEY constraint uniquely identifies each record in a database table. The primary

Tags: style http color io strong for AR Art Div www.169it.comAdd a table fieldALTER TABLE table1 add transactor varchar (ten) not Null;ALTER TABLE table1 add ID int unsigned not Null auto_increment primary keyModify the field type of a table and specify empty or non-emptyALTER TABLE name change field Name field Name field type [whether non-null allowed];ALTER TABLE name modify field Name field t

Access to Create a Table SQL statement Create Table to set AUTOINCREMENT for Automatically increasing columns, SQL statement createtable Access Table creation SQL statement Create Table setting AUTOINCREMENT for Automatically increasing Columns

SQL: The primary key of a data table is a varchar type, does not increment, how to insert a primary key when inserting data Reply content: SQL: The primary

At the beginning of this demand, in the online search, found all said no, you have to delete the primary key column and then re-add or create a temporary table before the data, in fact, can be directly modified in MySQL.Modify the ID field to self-increment the primary key:ALTER TABLE ' Test ' change ' ID ' ' id ' int (one) UNSIGNED not NULL auto_increment, add

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,'

Tags: tty out name Div Strong any res ext introDefinitions and examples see: http://www.runoob.com/sqlite/sqlite-autoincrement.htmlSqliteautoincrement (auto increment) SQLite's autoincrement is a keyword that is used to automatically increment the value of a field in a table. We can use the autoincrement keyword on a specific column name to automatically increase the value of the field when we create the ta

Simple tutorial on SQL statements in linux --- primary key, foreign key, and SQL Primary Key)Each item in is a unique value in the table. In other words, it is used to uniquely identify

---- 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