SQL Befehle ALTER

• Name
• Datentypen
• Index
• Löschen von Spalten
• Hinzufügen von Spalten

durchgeführt werden.

`ALTER TABLE' Syntax
--------------------

     ALTER [IGNORE] TABLE tbl_name alter_spec [, alter_spec ...]
     
     alter_specification:
             ADD [COLUMN] create_definition [FIRST | AFTER column_name ]
       or    ADD [COLUMN] (create_definition, create_definition,...)
       or    ADD INDEX [index_name] (index_col_name,...)
       or    ADD PRIMARY KEY (index_col_name,...)
       or    ADD UNIQUE [index_name] (index_col_name,...)
       or    ADD FULLTEXT [index_name] (index_col_name,...)
       or	 ADD [CONSTRAINT symbol] FOREIGN KEY index_name (index_col_name,...)
                 [reference_definition]
       or    ALTER [COLUMN] col_name {SET DEFAULT literal | DROP DEFAULT}
       or    CHANGE [COLUMN] old_col_name create_definition
       or    MODIFY [COLUMN] create_definition
       or    DROP [COLUMN] col_name
       or    DROP PRIMARY KEY
       or    DROP INDEX index_name
       or    RENAME [TO] new_tbl_name
       or    ORDER BY col
       or    table_options

Select mit JOIN

Die Syntax ist bereits bekannt.