How to select all the people that are not in any equipe ?
Hi,
I have a nice SQL expression that gives me as a result all the "AGENTS" (people) that are working in an EQUIPE (a team)
select a."AGENT_ID",
a."NOM" || ' ' || a."PRENOM" "Nom",
c.libelle "Equipe",
a."DATE_EMBAUCHE" "Date embauche",
a."DATE_DEBAUCHE" "Date débauche"
from OBSERVATOIRE."AGENT" a,
observatoire.equipe_agents b,
observatoire.equipe c
where a.agent_id = b.agent_id
and b.equipe_id = c.equipe_id
order by nom
Now, how to select all the agents that are NOT working in any "EQUIPE" (team) ?
I have tried but could not succeed !
Thank you for your kind help.
Christian
Christian from France wrote:
It is not working because the table EQUIPE_AGENTS does not contains a row if the agent is not into any equipe.
CREATE TABLE "OBSERVATOIRE"."EQUIPE_AGENTS"
( "EQUIPE_AGENTS_ID" NUMBER NOT NULL ENABLE,
"EQUIPE_ID" NUMBER NOT NULL ENABLE,
"AGENT_ID" NUMBER NOT NULL ENABLE)
CREATE TABLE "OBSERVATOIRE"."AGENT"
( "AGENT_ID" NUMBER NOT NULL ENABLE,
"GRADES_ID" NUMBER NOT NULL ENABLE,
"NOM" VARCHAR2(50 BYTE) NOT NULL ENABLE,
"PRENOM" VARCHAR2(50 BYTE),
"DATE_EMBAUCHE" DATE NOT NULL ENABLE,
"DATE_DEBAUCHE" DATE)
The only way to "know" if an agent is not into any equipe (team) is to search into the EQUIPE_AGENTS table, and if we do not find the ID of the agent into this table, then we know that this agent is not into any EQUIPE (team).
I don't know ho to translate this into SQL.And that's what my query does. It uses an OUTER JOIN so that a result record is returned whether or not there is a record in EQUIPE_AGENTS. And the check for EQUIPE_ID is NULL restricts the result set to those where there IS NOT a record in EQUIPE_AGENTS.
A more traditional way would be to use NOT IN or NOT EXISTS clauses, but they can prove inefficient.
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