sql create table with foreign key

MySQL displays the table-related foreign key relationship SQL and mysqlsql Just take over the MySQL DATA, often encounter the main foreign key relationship, there is no E-R diagram to help, functions through

closely matched, and for more information about signed and unsigned, see: http://www.verysimple.com/blog/?p=57 2, you are trying to reference one of the foreign keys did not establish an index, or not a primary key, if one of them is not primary key, you must create an index for it. 3, the name of the

database tutorial to ensure that the name is unique, or you add a few random characters after the key name to test whether this is the reason. 4, one or two tables are MyISAM engine tables, if you want to use a FOREIGN key constraint, you must be a InnoDB engine, (in fact, if two tables are MyISAM engines, this error does not occur at all, but it does not produ

Explore how SQL uses INFORMATION_SCHEMA system view to obtain the table's primary and foreign key information bitsCN.com 《 Parsing SQL table structure information query includes primary and foreign keys, auto-incrementThe INFORMAT

This error occurs because mysql has never been able to support the problem. Unfortunately, it does not specify which problem will lead to the above error, below I listed the common causes of this terrible 150 error, and sorted by the possibility size, known reasons: This error occurs because the mysql tutorial has never been well-supported. Unfortunately, it does not indicate which problem will lead to the above error, below I listed the common causes of this terrible 150 error, and sorted by t

GO--determine if the table exists in the way 1if object_id(N'Ef_user'N'U') is NULL--determine if the table exists in the way 2--If not EXISTS (SELECT * FROM dbo. SysObjects WHERE id = object_id (N ' [Ef_user] ') and OBJECTPROPERTY (ID, ' istable ') = 1)begin--directly create a table with the self-increment and specify

/* To create a foreign key in a new table */create table Sales.tempsalesreason (tempid int. not null,name nvarchar (), CONST Raint pk_tempsales PRIMARY key Nonclustered (tempid), CONSTR

Many tables in SQL Server have foreign key constraints. before deleting these tables, you must first Delete these foreign key constraints. The stored procedure used to delete the foreign key