Database Administrators Asked on December 24, 2021
I have read that a select query that stores a result into variables does not return a result set. Is there an efficient way to do both?
BEGIN
#return this and also use it in the following query
select id, name, table2_id
from table1
where id = variable_id;
select id, table2_name
from table2
where table2.id = table2.id from the previous result set
END
Here you can use user defined variables, as long as you only have only one table2.id
BEGIN
#return this and also use it in the following query
select id, name, @id := table2_id
from table1
where id = variable_id;
select id, table2_name
from table2
where table2.id = @id
END
Or if you have more than one table2.id
BEGIN
#return this and also use it in the following query
select id, name, table2.id
from table1
where id = variable_id;
select id, table2_name
from table2
where table2.id in (select table2<_id
from table1
where id = variable_id);
END
Or you can join directly, and ave only one result set
BEGIN
#return this and also use it in the following query
select t1.id, t1.name, t1.table2_id,t2,id, t2.table2_name
from table1 t1 INNER JOIN table2 t2 ON t2.id = t1.table2_id
where t1.id = variable_id;
END
Answered by nbk on December 24, 2021
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