I am performing insert operation like follow on Microsoft SQL Server Management Studio: This insert is supposed to make few hundreds of insert. But here I want to insert scode like C000512, C000513, C000514 …. and C000511 being the latest scode entry previously present in contacts. How do I make this SCODE insert unique for each insert? Previously I have
Tag: unique-key
How to know if an uncommitted transaction tries to insert a specific unique key into SQL
I’m writing a programm which inserts data to a MariaDB-Server and can be used by different people on the same time. The transactions take some time, so the following problem might occur: Person A …
make text column as unique key
i want to make a table in MySQL server with mediumtext column as UNIQUE KEY but this made an error when I change the type of `name` to varchar .. it works! can you tell if i can to make text column as UNIQUE KEY Answer Basically you can not use Text column as UNIQUE key. Because practically such a
Difference between primary key and unique key
I’m using a MySQL database. In which situations should I create a unique key or a primary key? Answer Primary Key: There can only be one primary key constraint in a table In some DBMS it cannot be NULL – e.g. MySQL adds NOT NULL Primary Key is a unique key identifier of the record Unique Key: Can be more