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sql-comandos's Introduction

SQL-COMANDOS

Comandos básicos da linguagem SQL voltados para Mysql


Criando um database

CREATE DATABASE empresa; 

Criando uma table funcionário

CREATE TABLE funcionario
(
   id int unsigned not null auto_increment,
   nome varchar(45) not null,
   salario double not null DEFAULT '0',
   departamento varchar(45) not null,
   PRIMARY KEY(id)
);

Criando table veiculos para relacionar com a table funcionarios

CREATE TABLE veiculos
(
    id int unsigned not null auto_increment,
    funcionario_id int unsigned default null,
    veiculo varchar(45) not null DEFAULT '',
    placa varchar(10) not null DEFAULT '',
    PRIMARY KEY(id),
    CONSTRAINT fk_veiculos_funcinarios FOREIGN KEY(funcionario_id) REFERENCES funcionario(id)
);

Criando a table salarios

create table salarios
(
    faixa varchar(45) not null,
    inicio double not null,
    fim double not null,
    PRIMARY KEY(faixa)
);

Alterando tables

ALTER TABLE funcionario CHANGE COLUMN nome nome_func varchar(50) not null;

Deletando a table salarios

DROP TABLE salarios;

Criando índices

CREATE INDEX departamentos ON funcionario(departamento);
CREATE INDEX nomes ON funcionario(nome);

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