MySQL Cheat Sheet

Hello friends today i am going to start a thread which teaches you about some useful syntax, functions, and queries for MySQL which can MySQL injection attack on websites over a period of time part by part. Here are some in part 1 as follow:

Users:
SELECT USER()
SELECT SYSTEM_USER()
SELECT SESSION_USER()
SELECT CURRENT_USER()

Version:
SELECT VERSION()
SELECT @@version
SELECT @@version_comment
SELECT @@version_compile_machine
SELECT @@version_compile_os

Directories:
SELECT @@basedir
SELECT @@tmpdir
SELECT @@datadir

Current Database:
SELECT DATABASE()

Concatenation:
SELECT CONCAT('foo','.','bar'); #Returns: foo.bar
SELECT CONCAT_WS(' ','Hello','MySQL','and','hello','world!'); #Returns: Hello MySQL and hello world!

Multi-Concat:

#Stacks the row "foo" from the table "bar" together, using the separator "
".
#Note: This operation can by default only grab 1024 bytes, and do not allow LIMIT.
#The 1024 byte limit is stored in the @@group_concat_max_len variable.

SELECT GROUP_CONCAT(foo SEPARATOR '
') FROM bar

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