SQLite has a function called nullif() and another function called ifnull(), each of which serve a different purpose.
nullif() allows you to treat certain values as NULL. You can think of it as “return NULL if …”.ifnull() allows you to replace NULL values with another value. You can think of it as “if NULL, then …”.So they basically do the opposite of each other. One replaces NULL values with another value, and the other replaces another value with NULL.
Continue readingThe SQLite typeof() function allows you to determine the data type of an expression.
An expression can be one of the following data types:
The SQLite randomblob() function returns a blob containing pseudo-random bytes.
The number of bytes is determined by its argument. If its argument is less than 1 then a 1-byte random blob is returned.
Continue readingThe 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.
Continue readingIn SQLite, you can use the unicode() function to return the unicode code point for a given character.
The way it works is that it returns the unicode code point for the first character of the string that you provide.
Continue readingSQLite 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.
In SQLite, you can use a PRAGMA statement to return a list of foreign keys for a given table.
Continue readingSQLite is a widely-used lightweight, embedded relational database management system (RDBMS).
SQLite is a C-language library that implements a small, fast, self-contained, high-reliability, full-featured, SQL database engine. SQLite is largely SQL standards compliant, and it is fully ACID compliant.
Continue readingThis page contains a list of aggregate functions that are available in SQLite by default.
Continue readingIf 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.