From Grupo6 Especoo

Revision as of 11:25, 6 December 2006 (edit) 143.106.1.73 (Talk) (→13 - Consultas de BD) ← Previous diff		Revision as of 12:06, 6 December 2006 (edit) (undo) 143.106.1.73 (Talk) (→13 - Consultas de BD) Next diff →
Line 39:		Line 39:
	SQL		SQL
-	select a.idatend from atendentes a where especialidade = 'software';	+	r1 := select a.idatend from atendentes a where especialidade = 'software';
		+
		+
		+	Selecionar todos os chamados com status 'aberto'
		+
		+	Álgebra relacional
		+
		+	r1 := project idstatus(select descricao = 'aberto' (statuschamado));
		+
		+	r2 := project nro, departamento, descricao (chamado njoin r1);
		+
		+	Cálculo Relaciona de Tuplas
		+
		+	r1 := {C.nro, C.departamento, C.descricao | (exists S) ( statuschamado(S) and chamado(C)
		+
		+	and S.descricao = 'aberto' and C.idstatus = S.idstatus)  };
		+
		+	SQL
		+
		+	r1 := select C.nro, C.departamento, C.descricao from chamado C where C.idstatus in (select
		+
		+	idstatus from statuschamado S where S.descricao = 'aberto');

---

Revision as of 12:06, 6 December 2006

13 - Consultas de BD

Consultas utilizadas nos use cases:

insert chamado

select chamado where status aberto

update chamado prioridade, idAtendente, status

select atendente

select chamado where id atendente

update chamado status

select chamado nrochamado

update chamado status

update chamado id avaliacao

Selecionar todos os ids dos atendentes de software

Álgebra relacional

r1 := select especialidade = 'software' (atendentes);

r2 := project idatend (r1);

Cálculo Relaciona de Tuplas

r1 := { A.idatend | atendentes(A) and A.especialidade = 'software'};

SQL

r1 := select a.idatend from atendentes a where especialidade = 'software';

Selecionar todos os chamados com status 'aberto'

Álgebra relacional

r1 := project idstatus(select descricao = 'aberto' (statuschamado));

r2 := project nro, departamento, descricao (chamado njoin r1);

Cálculo Relaciona de Tuplas

r1 := {C.nro, C.departamento, C.descricao | (exists S) ( statuschamado(S) and chamado(C)

and S.descricao = 'aberto' and C.idstatus = S.idstatus) };

SQL

r1 := select C.nro, C.departamento, C.descricao from chamado C where C.idstatus in (select

idstatus from statuschamado S where S.descricao = 'aberto');