SQLite – Page 25

How SQLite Upper() Works

May 28, 2020May 19, 2020 by Ian

The SQLite upper() function allows you to convert a string to uppercase characters.

More precisely, it returns a copy of its argument, with all ASCII characters converted to uppercase.

How SQLite Nullif() Works

May 28, 2020May 19, 2020 by Ian

The SQLite nullif() function is a handy function that allows you to treat certain values as NULL when required.

It’s not to be confused with the ifnull() function, which does the opposite – enables you to treat NULL values as something else.

The nullif() function accepts two arguments, and returns its first argument if the arguments are different and NULL if the arguments are the same.

How SQLite Random() Works

June 28, 2020May 19, 2020 by Ian

The SQLite random() function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807.

A pseudo-random number is a number that appears to be random, but is not truely random. A pseudo-random number is not truely random because its value was generated by a known seed. However, a pseudo-random number will appear to be random if the user has no knowledge of the seed or algorithm that created it.

Therefore, pseudo-random numbers are often considered good enough for many applications.

How SQLite Ifnull() Works

May 28, 2020May 18, 2020 by Ian

The SQLite ifnull() function allows you to replace NULL values with another value.

It takes two arguments, and it returns a copy of its first non-NULL argument, or NULL if both arguments are NULL.

The ifnull() function is equivalent to coalesce() with two arguments.

How Coalesce() Works in SQLite

May 28, 2020May 18, 2020 by Ian

In SQLite, the coalesce() function returns a copy of its first non-NULL argument, or NULL if all arguments are NULL.

It’s similar to the ifnull() function, except that coalesce() accepts more than two arguments (ifnull() only accepts two arguments).

How SQLite Trim() Works

May 28, 2020May 17, 2020 by Ian

The SQLite trim() function trims whitespace or other characters from both sides of a string.

The function returns a copy of the string that you provide as an argument, with either whitespace, or other characters as specified, trimmed from both sides.

How SQLite Rtrim() Works

May 28, 2020May 17, 2020 by Ian

In SQLite, the rtrim() function enables you to trim whitespace or other characters from the right part of a string.

It returns a copy of the string that you provide as an argument, with the right part trimmed of either whitespace, or other characters as specified.

How SQLite Ltrim() Works

May 28, 2020May 17, 2020 by Ian

The SQLite ltrim() function trims whitespace or other characters from the left of a string.

More precisely, it returns a copy of the string that you provide as an argument, with the left part trimmed of either whitespace, or other characters that you specify.

How to Change the Command Line Prompt in SQLite

May 28, 2020May 16, 2020 by Ian

If you’ve ever used the SQLite command line shell, you’re probably familiar with the default command line prompt. Actually, there are two prompts:

The default main prompt looks like this: sqlite>
The default continuation prompt looks like this: ...>

If you don’t like these prompts, you can always change them with the .prompt dot command.

This article provides a quick demonstration on how to change these prompts.

How to Make SQLite’s LIKE Operator Case-Sensitive

May 28, 2020May 15, 2020 by Ian

By default, the SQLite LIKE operator is case-insensitive for ASCII characters. This means it will match uppercase and lowercase characters, regardless of which case you use in your pattern.

However, there is a technique you can use to make it case-sensitive.