SQLITE INSERT NULL FOR DOUBLE HOW TO

And each supplier group may have zero or many suppliers. ) Code language: SQL (Structured Query Language) ( sql )Īssuming that each supplier belongs to one and only one supplier group. Let’s start with two tables: suppliers and supplier_groups : CREATE TABLE suppliers ( To enable foreign key constraint: PRAGMA foreign_keys = ON Code language: SQL (Structured Query Language) ( sql ) Introduction to the SQLite foreign key constraints

To disable foreign key constraint: PRAGMA foreign_keys = OFF Code language: SQL (Structured Query Language) ( sql ) If the SQLite library is compiled with foreign key constraint support, the application can use the PRAGMA foreign_keys command to enable or disable foreign key constraints at runtime. If the command returns nothing, it means that your SQLite version doesn’t support foreign key constraints. The command returns an integer value: 1: enable, 0: disabled. PRAGMA foreign_keys Code language: SQL (Structured Query Language) ( sql ) To check whether your current version of SQLite supports foreign key constraints or not, you use the following command. The SQLite library must also be compiled with neither SQLITE_OMIT_FOREIGN_KEY nor SQLITE_OMIT_TRIGGER. SQLite has supported foreign key constraint since version 3.6.19.

SQLITE INSERT NULL FOR DOUBLE HOW TO

Summary: in this tutorial, you will learn how to use the SQLite foreign key constraint to enforce the relationships between related tables.

Sqlite insert null for double