SQL

Annotations:

• http://www.tech-recipes.com/rx/55356/dml-ddl-dcl-and-tcl-statements-in-sql-with-examples/

1. DML
   1. select
   2. insert
   3. update
   4. delete
2. DDL
   1. create
   2. alter
   3. drop
   4. Dominios
      1. Char()
      2. Varchar()
      3. int
      4. smallint
      5. numeric
      6. real,doble
      7. float
3. DCL
   1. grant
   2. revoke
4. TCL
   1. commit
   2. rollback
   3. begin
5. Variables Tupla
6. Comodines
   2. "_" :coincide con cualquier caracter
   3. "%" : coincide con cualquier cadena