SQLite has many built-in functions for dealing with string or numeric data. Here are some useful SQLite built-in functions, all of which are case-insensitive, which means you can use these functions in lowercase or uppercase or mixed form. For more information, please check the official documentation of SQLite:
Serial number | Function & description |
|---|---|
1 | SQLite COUNT function |
| |
2 | SQLite MAX function |
| |
3 | SQLite MIN function |
| |
4 | SQLite AVG function |
| |
5 | SQLite SUM function |
| |
6 | SQLite RANDOM function |
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7 | SQLite ABS function |
| |
8 | SQLite UPPER function |
| |
9 | SQLite LOWER function |
| |
10 | SQLite LENGTH function |
| |
11 | SQLite sqlite_version function |
|
Before we begin to explain these function examples, assume that 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
1.46.1. SQLite COUNT function ¶
SQLite
COUNT
The aggregate function is used to calculate the number of rows in a database table. Here is an example:
sqlite> SELECT count(*) FROM COMPANY;
Above.
SQLite
SQL
Statement will produce the following results:
count(*)
----------
7
1.46.2. SQLite MAX function ¶
SQLite
MAX
The aggregate function allows us to select the maximum value of a column. Here is an example:
sqlite> SELECT max(salary) FROM COMPANY;
Above.
SQLite
SQL
Statement will produce the following results:
max(salary)
-----------
85000.0
1.46.3. SQLite MIN function ¶
The 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 produces the following results:
min(salary)
-----------
10000.0
1.46.4. SQLite AVG function ¶
The SQLite AVG aggregate function calculates the average of a column. Here is an example:
sqlite> SELECT avg(salary) FROM COMPANY;
The above SQLite SQL statement produces the following results:
avg(salary)
----------------
37142.8571428572
1.46.5. SQLite SUM function ¶
The SQLite SUM aggregate function allows you to calculate the sum for a numeric column. Here is an example:
sqlite> SELECT sum(salary) FROM COMPANY;
The above SQLite SQL statement produces the following results:
sum(salary)
-----------
260000.0
1.46.6. 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 produces the following results:
Random
-------------------
5876796417670984050
1.46.7. 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 produces the following results:
abs(5) abs(-15) abs(NULL) abs(0) abs("ABC")
---------- ---------- ---------- ---------- ----------
5 15 0 0.0
1.46.8. 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 produces the following results:
upper(name)
-----------
PAUL
ALLEN
TEDDY
MARK
DAVID
KIM
JAMES
1.46.9. 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 produces the following results:
lower(name)
-----------
paul
allen
teddy
mark
david
kim
james
1.46.10. SQLite LENGTH function ¶
The SQLite LENGTH function returns the length of the string. Here is an example:
sqlite> SELECT name, length(name) FROM COMPANY;
The above SQLite SQL statement produces the following results:
NAME length(name)
---------- ------------
Paul 4
Allen 5
Teddy 5
Mark 4
David 5
Kim 3
James 5
1.46.11. 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 produces the following results:
SQLite Version
--------------
3.6.20