Is there a way to get the name of primary key field from mysql-database? For example: I have a t开发者_运维知识库able like this:
My primary indexes are unique reference numbers like 002345 and 000023. If I format them as integers I loose my zero\'s. They need to be 6 digits.
Hi I had parent table which has ID and some other columns and a child table which have many values based on this ID(foreign Key). I wanted to create the table with a Primary Key which is sequence and
I\'ve made mistake creating clustered primary key on GUID column. There are many tables that reference that table with defined 开发者_StackOverflow中文版foreign keys.
What meaning does the concept of a primary key have to the database engine of SQL Server? I don\'t mean the clustered/nonclustered index created on the \"ID\" column, i mean the constraint objec开发者
Let\'s say I have some table T with some non-null field A. There is a clustered index on A. Consider the following two options:
I need help in auto populating the primary key values in foreign key table while inserting data in foreign key table. For Example: I have created table:
I am building a web app using GAE Java. I have a class that uses a Long ID (generated by appengine) as its primary key.
I would like to see an example of: When this is appropriate When this is not appropriate Is there a time when the choice of da开发者_StackOverflowtabase would make a difference to the above exampl
This question already has answers here开发者_运维知识库: sql primary key and index (11 answers)
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