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SQLite `Common Functions`

SQLite has many built-in functions for string or numeric data processing. Below is a list of some useful SQLite built-in functions, and all these functions are case-insensitive, meaning you can use the lowercase, uppercase, or mixed forms of these functions. For more details, please refer to the official SQLite documentation:

No.	Function & Description
1	SQLite COUNT Function <br>SQLite COUNT aggregate function is used to count the number of rows in a database table.
2	SQLite MAX Function <br>SQLite MAX aggregate function allows us to select the maximum value of a column.
3	SQLite MIN Function <br>SQLite MIN aggregate function allows us to select the minimum value of a column.
4	SQLite AVG Function <br>SQLite AVG aggregate function calculates the average value of a column.
5	SQLite SUM Function <br>SQLite SUM aggregate function allows for the summation of a numeric column.
6	SQLite RANDOM Function <br>SQLite RANDOM function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807.
7	SQLite ABS Function <br>SQLite ABS function returns the absolute value of the numeric parameter.
8	SQLite UPPER Function <br>SQLite UPPER function converts a string to uppercase letters.
9	SQLite LOWER Function <br>SQLite LOWER function converts a string to lowercase letters.
10	SQLite LENGTH Function <br>SQLite LENGTH function returns the length of a string.
11	SQLite sqlite_version Function <br>SQLite sqlite_version function returns the version of the SQLite library.

Before we start explaining these function examples, let's assume the COMPANY table has the following records:

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0

SQLite COUNT Function

SQLite COUNT aggregate function is used to count the number of rows in a database table. Here is an example:

sqlite> SELECT count(*) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

count(*)
----------
7

SQLite MAX Function

SQLite MAX aggregate function allows us to select the maximum value of a column. Here is an example:

sqlite> SELECT max(salary) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

max(salary)
-----------
85000.0

SQLite MIN Function

SQLite MIN aggregate function allows us to select the minimum value of a column. Here is an example:

sqlite> SELECT min(salary) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

min(salary)
-----------
10000.0

SQLite AVG Function

SQLite AVG aggregate function calculates the average value of a column. Here is an example:

sqlite> SELECT avg(salary) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

avg(salary)
----------------
37142.8571428572

SQLite SUM Function

The SQLite SUM aggregate function allows the summation of a numeric column. Here is an example:

sqlite> SELECT sum(salary) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

sum(salary)
-----------
260000.0

SQLite RANDOM Function

The SQLite RANDOM function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807. Here is an example:

sqlite> SELECT random() AS Random;

The above SQLite SQL statement will produce the following result:

Random
-------------------
5876796417670984050

SQLite ABS Function

The SQLite ABS function returns the absolute value of a numeric parameter. Here is an example:

sqlite> SELECT abs(5), abs(-15), abs(NULL), abs(0), abs("ABC");

The above SQLite SQL statement will produce the following result:

abs(5)      abs(-15)    abs(NULL)   abs(0)      abs("ABC")
----------  ----------  ----------  ----------  ----------
5           15                      0           0.0

SQLite UPPER Function

The SQLite UPPER function converts a string to uppercase letters. Here is an example:

sqlite> SELECT upper(name) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

upper(name)
-----------
PAUL
ALLEN
TEDDY
MARK
DAVID
KIM
JAMES

SQLite LOWER Function

The SQLite LOWER function converts a string to lowercase letters. Here is an example:

sqlite> SELECT lower(name) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

lower(name)
-----------
paul
allen
teddy
mark
david
kim
james

SQLite LENGTH Function

The SQLite LENGTH function returns the length of a string. Here is an example:

sqlite> SELECT name, length(name) FROM COMPANY;

The above SQLite SQL statement will produce the following result:

NAME        length(name)
----------  ------------
Paul        4
Allen       5
Teddy       5
Mark        4
David       5
Kim         3
James       5

SQLite sqlite_version Function

The SQLite sqlite_version function returns the version of the SQLite library. Here is an example:

sqlite> SELECT sqlite_version() AS 'SQLite Version';

The above SQLite SQL statement will produce the following result:

SQLite Version
--------------
3.6.20

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