SQLite common functions
SQLite has many built-in functions for working with string or numeric data. Listed below are some useful SQLite built-in functions, and all functions are case-insensitive, which means you can use lowercase or uppercase or mixed forms of these functions. For more details, please check the official documentation of SQLite:
| Serial Number | Function & Description |
|---|---|
| 1 | SQLite COUNT function SQLite COUNT aggregate function is used to count the number of rows in a database table. |
| 2 | SQLite MAX function SQLite MAX aggregate function allows us to select the maximum value of a column. |
| 3 | SQLite MIN function SQLite MIN aggregate function allows us to select the minimum value of a column. |
| 4 | SQLite AVG function SQLite AVG aggregate function calculates the average of a column. |
| 5 | SQLite SUM function SQLite SUM aggregate function allows calculating the sum 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 SQLite ABS function returns the absolute value of a numeric argument. |
| 8 | SQLite UPPER function The SQLite UPPER function converts a string to uppercase letters. |
| 9 | SQLite LOWER function The SQLite LOWER function converts a string to lowercase letters. |
| 10 | SQLite LENGTH function SQLite LENGTH function returns the length of a string. |
| 11 | SQLite sqlite_version function SQLite sqlite_version function returns the version of the SQLite library. |
Before we start explaining 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
SQLite COUNT function
SQLite COUNT aggregate function is used to count rows in a database table number. Here is an example:
sqlite> SELECT count(*) FROM COMPANY;
The above SQLite SQL statement will produce the following results:
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 results:
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 results:
min(salary) ----------- 10000.0
SQLite AVG Function
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 will produce the following results:
avg(salary) ---------------- 37142.8571428572
SQLite SUM function
SQLite SUM aggregate function allows calculating the sum for a numeric column. The following is an example:
sqlite> SELECT sum(salary) FROM COMPANY;
The above SQLite SQL statement will produce the following results:
sum(salary) ----------- 260000.0
SQLite RANDOM function
The SQLite RANDOM function returns a value between -9223372036854775808 and +9223372036854775807 pseudo-random integers between. The following is an example:
sqlite> SELECT random() AS Random;
The above SQLite SQL statement will produce the following results:
Random ------------------- 5876796417670984050
SQLite ABS function
The SQLite ABS function returns the absolute value of a numeric argument. The following is an example:
sqlite> SELECT abs(5), abs(-15), abs(NULL), abs(0), abs("ABC");The above SQLite SQL statement will produce the following results:
abs(5) abs(-15) abs(NULL) abs(0) abs("ABC")
---------- ---------- ---------- ---------- ----------
5 15 0 0.0SQLite UPPER function
The SQLite UPPER function converts a string to uppercase letters. The following is an example:
sqlite> SELECT upper(name) FROM COMPANY;
The above SQLite SQL statement will produce the following results:
upper(name) ----------- PAUL ALLEN TEDDY MARK DAVID KIM JAMES
SQLite LOWER function
The SQLite LOWER function converts a string to lowercase letters. The following is an example:
sqlite> SELECT lower(name) FROM COMPANY;
The above SQLite SQL statement will produce the following results:
lower(name) ----------- paul allen teddy mark david kim james
SQLite LENGTH function
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 results:
NAME length(name) ---------- ------------ Paul 4 Allen 5 Teddy 5 Mark 4 David 5 Kim 3 James 5
SQLite sqlite_version function
SQLite sqlite_version function returns the version of the SQLite library. The following is an example:
sqlite> SELECT sqlite_version() AS 'SQLite Version';
The above SQLite SQL statement will produce the following results:
SQLite Version -------------- 3.6.20
