/* The PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the ...

In mysql, the primary key constraint is used to uniquely identify each record in a table.primary key contains unique values only and the column defined as primary key column can not be null. a table ...

I have a question regarding of using CUID’s in MySQL and their performance characteristics. I can see in the Prisma source code that they store cuid's as VARCHAR(25) for id columns, which implies ( ...

Duplicate and Ignore on MySQL Inserts. MySQL table primary keys and unique indexes prevent multiple rows with the same index from being added to the table. If you try to insert a duplicate row ...

Now, this app uses surrogate keys extensively (Django doesn't allow composite primary keys and encourages the use of surrogates heavily). For the first migration scripts I've tentatively skipped ...

Can you do a foreign key within a single table, though? I've only ever seen foreign key constraints tying a field in one table to a field in another table.