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Daniel Futerman wrote:
What is the script trying to do (in a wider sense)?
The variable is used as follows:
SET @OTHER_CONCEPT_ID = (SELECT `concept_id` FROM `concept_name` where name
= 'MRO' LIMIT 1);
(SELECT
COALESCE(f2.concept_id, @OTHER_CONCEPT_ID ) as 'concept_id'
FROM
`field` f, `field` f2, `form_field` ff, `form_field` ff2, `form`
WHERE
form.form_id = ff.form_id AND
ff.field_id = f.field_id AND
f.concept_id = obs.concept_id AND
ff.parent_form_field = ff2.form_field_id AND
ff2.field_id = f2.field_id
LIMIT 1
);
I don't see what this gets you that a subquery / join doesn't.
SELECT
COALESCE(f2.concept_id, default_concept.concept_id) AS concept_id
FROM
...
,(SELECT concept_id FROM concept_name WHERE name='MRO') AS
default_concept
WHERE
I've left the LIMIT 1 off since I'm assuming name is unique - if not the
LIMIT 1 doesn't make any sense without an ORDER BY too.
--
Richard Huxton
Archonet Ltd
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