SQLite - Useful Functions


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SQLite has many built-in functions for performing processing on string or numeric data. Following is the list of few useful SQLite built-in functions and all are case in-sensitive which means you can use these functions either in lower-case form or in upper-case or in mixed form. For more details, you can check official documentation for SQLite:

S.N. Function & Description
1 SQLite COUNT Function

The SQLite COUNT aggregate function is used to count the number of rows in a database table.

2 SQLite MAX Function

The SQLite MAX aggregate function allows us to select the highest (maximum) value for a certain column.

3 SQLite MIN Function

The SQLite MIN aggregate function allows us to select the lowest (minimum) value for a certain column.

4 SQLite AVG Function

The SQLite AVG aggregate function selects the average value for certain table column.

5 SQLite SUM Function

The SQLite SUM aggregate function allows selecting the total for a numeric column.

6 SQLite RANDOM Function

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

7 SQLite ABS Function

The SQLite ABS function returns the absolute value of the numeric argument.

8 SQLite UPPER Function

The SQLite UPPER function converts a string into upper-case letters.

9 SQLite LOWER Function

The SQLite LOWER function converts a string into lower-case letters.

10 SQLite LENGTH Function

The SQLite LENGTH function returns the length of a string.

11 SQLite sqlite_version Function

The SQLite sqlite_version function returns the version of the SQLite library.

Before we start giving examples on the above-mentioned functions, consider COMPANY table is having 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

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

sqlite> SELECT count(*) FROM COMPANY;

Above SQLite SQL statement will produce the following result:

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

SQLite MAX Function

The SQLite MAX aggregate function allows us to select the highest (maximum) value for a certain column. Following is the example:

sqlite> SELECT max(salary) FROM COMPANY;

Above SQLite SQL statement will produce the following result:

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

SQLite MIN Function

The SQLite MIN aggregate function allows us to select the lowest (minimum) value for a certain column. Following is the example:

sqlite> SELECT min(salary) FROM COMPANY;

Above SQLite SQL statement will produce the following result:

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

SQLite AVG Function

The SQLite AVG aggregate function selects the average value for certain table column. Following is the example:

sqlite> SELECT avg(salary) FROM COMPANY;

Above SQLite SQL statement will produce the following result:

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

SQLite SUM Function

The SQLite SUM aggregate function allows selecting the total for a numeric column. Following is the example:

sqlite> SELECT sum(salary) FROM COMPANY;

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. Following is the example:

sqlite> SELECT random() AS Random;

Above SQLite SQL statement will produce the following result:

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

SQLite ABS Function

The SQLite ABS function returns the absolute value of the numeric argument. Following is the example:

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

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 into upper-case letters. Following is the example:

sqlite> SELECT upper(name) FROM COMPANY;

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 into lower-case letters. Following is the example:

sqlite> SELECT lower(name) FROM COMPANY;

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. Following is the example:

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

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. Following is the example:

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

Above SQLite SQL statement will produce the following result:

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


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