SQLite has many built-in functions to perform 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.
| Sr.No. | Function & Description |
|---|---|
| 1 | SQLite COUNT FunctionSQLite COUNT aggregate function is used to count the number of rows in a database table. |
| 2 | SQLite MAX FunctionSQLite MAX aggregate function allows us to select the highest (maximum) value for a certain column. |
| 3 | SQLite MIN FunctionSQLite MIN aggregate function allows us to select the lowest (minimum) value for a certain column. |
| 4 | SQLite AVG FunctionSQLite AVG aggregate function selects the average value for certain table column. |
| 5 | SQLite SUM FunctionSQLite SUM aggregate function allows selecting the total for a numeric column. |
| 6 | SQLite RANDOM FunctionSQLite RANDOM function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807. |
| 7 | SQLite ABS FunctionSQLite ABS function returns the absolute value of the numeric argument. |
| 8 | SQLite UPPER FunctionSQLite UPPER function converts a string into upper-case letters. |
| 9 | SQLite LOWER FunctionSQLite LOWER function converts a string into lower-case letters. |
| 10 | SQLite LENGTH FunctionSQLite LENGTH function returns the length of a string. |
| 11 | SQLite sqlite_version FunctionSQLite sqlite_version function returns the version of the SQLite library. |
Before we start giving examples on the above-mentioned functions, consider COMPANY table with 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. Following is an example −
sqlite> SELECT count(*) FROM COMPANY;
The above SQLite SQL statement will produce the following.
count(*) ---------- 7
SQLite MAX Function
SQLite MAX aggregate function allows us to select the highest (maximum) value for a certain column. Following is an example −
sqlite> SELECT max(salary) FROM COMPANY;
The above SQLite SQL statement will produce the following.
max(salary) ----------- 85000.0
SQLite MIN Function
SQLite MIN aggregate function allows us to select the lowest (minimum) value for a certain column. Following is an example −
sqlite> SELECT min(salary) FROM COMPANY;
The above SQLite SQL statement will produce the following.
min(salary) ----------- 10000.0
SQLite AVG Function
SQLite AVG aggregate function selects the average value for a certain table column. Following is an the example −
sqlite> SELECT avg(salary) FROM COMPANY;
The above SQLite SQL statement will produce the following.
avg(salary) ---------------- 37142.8571428572
SQLite SUM Function
SQLite SUM aggregate function allows selecting the total for a numeric column. Following is an example −
sqlite> SELECT sum(salary) FROM COMPANY;
The above SQLite SQL statement will produce the following.
sum(salary) ----------- 260000.0
SQLite RANDOM Function
SQLite RANDOM function returns a pseudo-random integer between -9223372036854775808 and +9223372036854775807. Following is an example −
sqlite> SELECT random() AS Random;
The above SQLite SQL statement will produce the following.
Random ------------------- 5876796417670984050
SQLite ABS Function
SQLite ABS function returns the absolute value of the numeric argument. 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.
abs(5) abs(-15) abs(NULL) abs(0) abs("ABC")
---------- ---------- ---------- ---------- ----------
5 15 0 0.0
SQLite UPPER Function
SQLite UPPER function converts a string into upper-case letters. Following is an example −
sqlite> SELECT upper(name) FROM COMPANY;
The above SQLite SQL statement will produce the following.
upper(name) ----------- PAUL ALLEN TEDDY MARK DAVID KIM JAMES
SQLite LOWER Function
SQLite LOWER function converts a string into lower-case letters. Following is an example −
sqlite> SELECT lower(name) FROM COMPANY;
The above SQLite SQL statement will produce the following.
lower(name) ----------- paul allen teddy mark david kim james
SQLite LENGTH Function
SQLite LENGTH function returns the length of a string. Following is an example −
sqlite> SELECT name, length(name) FROM COMPANY;
The above SQLite SQL statement will produce the following.
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. Following is an example −
sqlite> SELECT sqlite_version() AS 'SQLite Version';
The above SQLite SQL statement will produce the following.
SQLite Version -------------- 3.6.20