The SQLite typeof() function allows you to determine the data type of an expression.
An expression can be one of the following data types:
- null
- integer
- real
- text
- blob
SQLite
How Replace() Works in SQLite
The SQLite replace() function enables us to replace one string (or part of a string) with another string.
The way it works is that you provide three arguments; the string that contains the substring to replace, the substring within that string to replace, and the string to replace it with.
Find Foreign Key Violations in SQLite
SQLite includes a PRAGMA statement that allows you to check for foreign key violations on a whole database or a given table.
The statement is PRAGMA foreign_key_check, and it works as follows.
Return a List of Foreign Keys in SQLite
In SQLite, you can use a PRAGMA statement to return a list of foreign keys for a given table.
What is SQLite?
How to Enable/Disable CHECK Constraints in SQLite
If you ever need to enable or disable all CHECK constraints in SQLite, you can use the ignore_check_constraints PRAGMA statement.
This pragma statement explicitly enables or disables the enforcement of CHECK constraints. The default setting is off, meaning that CHECK constraints are enforced by default.
Create a CHECK Constraint in SQLite
In SQLite, you can create a CHECK constraint by adding the applicable code within the CREATE TABLE statement when creating the table.
If a table has a CHECK constraint on it, and you try to insert or update data that violates the CHECK constraint, the operation will fail with an error.