The NOT NULL constraint is used to prevent null values from being entered into one or more columns within a table, thereby sustaining data integrity IBM. It is essential to apply NOT NULL constraints ...

HeidiSQL version: 11.2.0.6213 Database type and version: MYSQL 8.0.22 OS: WINDOWS 10 ** Bug** Table check constraint tab doesn't show any constraints for tables that have them. To Reproduce CREATE ...

Hi, First of all, I've used NPoco with MySQL before, and it worked great. Recently, I tried to use it with Postgres using the Npgsql driver. It keeps telling me that "null value in column "id" ...

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 ...

In mysql, the not null constraint is used to restrict a column to not accept null values.the not null constraint allows a column to always contains a value which means you cant not insert/update a ...

DBDetective for Oracle is a metadata mining tool for detecting and correcting possible violations of some crucial database (db) design, implementation, usage, and optimization best practice rules ...