如何将表联接到此SQL代码？

Question

I am using this awesome code from @Richard aka cyberkiwi to run a query (it returns the sum of value for each month, for each plant):

table name: data

record_id   id_fk    plant_id_fk    date         value   category_1
1           1          1            2011-03-01   10      A
2           1          1            2011-03-02   10      A
3           1          1            2011-04-10   5       B
4           1          2            2011-04-15   5       C

SQL code

    select up.id_fk, up.plant_id_fk, ym2, ifnull(sum(data.value_1),0) totalvalue_1
    from (select distinct date_format(date, '%Y-%m') ym, date_format(date, '%M %Y') ym2 from data) dates
    cross join (select distinct data.id_fk, data.plant_id_fk from data) up
    left join data on date_format(data.date, '%Y-%m') = dates.ym
        and up.id_fk=data.id_fk
        and up.plant_id_fk=data.plant_id_fk
        and category_1='A'
    group by up.id_fk, up.plant_id_fk, ym2, ym
    order by up.id_fk, up.plant_id_fk, date(concat(ym,'-1'))

Now I need to join this with the following table in order to run a PHP loop that will retrieve the plant_name instead of the plant_id .

table name: plants

id_fk    plant_id      plant_name
1        1             oak tree
1        2             cherry tree

Anyone know where to insert the clause that would create this join?

Thanks!

Answer 1

Modified as shown below

select
up.id_fk,
p.plant_name,
ym2,
ifnull(sum(data.value_1),0) totalvalue_1
from (
select distinct date_format(date, '%Y-%m') ym, date_format(date, '%M %Y') ym2
from data) dates
cross join (
select distinct data.id_fk, data.plant_id_fk
from data) up
inner join plants p on p.plant_id = up.plant_id_fk
left join data
on date_format(data.date, '%Y-%m') = dates.ym
and up.id_fk=data.id_fk
and up.plant_id_fk=data.plant_id_fk
and category_1='A'
group by up.id_fk, up.plant_id_fk, ym2, ym, p.plant_name
order by up.id_fk, up.plant_id_fk, date(concat(ym,'-1'))

Answer 2

Hm. I don't think the recordset and the query are matching; I don't see the field record_id from the fieldset. I will adjust the query you provided.

select up.id_fk, up.plant_id_fk, pn.plant_name, ym2, ifnull(sum(data.value_1),0) totalvalue_1
    from (select distinct date_format(date, '%Y-%m') ym, date_format(date, '%M %Y') ym2 from data) dates
    cross join (select distinct data.id_fk, data.plant_id_fk from data) up
    left join data on date_format(data.date, '%Y-%m') = dates.ym
        and up.id_fk=data.id_fk
        and up.plant_id_fk=data.plant_id_fk
        and category_1='A'
    INNER JOIN plants pn ON up.plant_id_fk = pn.plant_id
    group by up.id_fk, up.plant_id_fk, ym2, ym
    order by up.id_fk, up.plant_id_fk, date(concat(ym,'-1'))

This should work. I added the pn.plant_name to the SELECT area, and used a INNER JOIN to join the plants table to the up selection for the field plant_id_fk.

As an aside, it makes it a lot easier to read if the SQL elements are capitalized (SELECT, JOIN, GROUP etc) as well as your table definitions (UP, YM2, YM, DATES etc etc). This is just my personal preference.

Nishan Karassik www.medfocusrcm.com

Answer 3

Just before the group by

left join plants on data.id_fk=plants.id_fk and data.plant_id_fk=plants.plant_id

and then replace in the group by and select {up.id_fk, up.plant_id_fk} by plant.plant_name