2.1.8 Comandos generales de alta y baja de DBMS

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Mind Map on 2.1.8 Comandos generales de alta y baja de DBMS, created by netwo03 on 26/03/2015.
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Mind Map by netwo03, updated more than 1 year ago More Less
maria gonzalez5024
Created by maria gonzalez5024 over 9 years ago
netwo03
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2.1.8 Comandos generales de alta y baja de DBMS
  1. (DROP) Eliminación
    1. DROP TABLE nombre_tabla [CASCADE CONSTRAINTS][PURGE]
    2. Modificación
      1. ALTER TABLE [esquema.]tabla clausula_constraint [,…] [ENABLE clausula_activa | DISABLE clausula_disable] [{ENABLE|DISABLE} TABLE LOCK] [{ENABLE|DISABLE} ALL TRIGGERS];
      2. ADD NOT NULL solo sera posible si la tabla esta vacia MODIFI NOT NULL solo se podra modificazr siempre y cuando
        1. Comando Describe
          1. DESCRIBE f1;
          2. SHOW TABLES SHOW CREATE TABLE
            1. Eliminar una llave foranea
              1. ALTER TABLE automovil DROP FOREIGN KEY FK_Propietario;
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