* Stig Nørgaard Jepsen
> Is it possible to make a query in MySQL, which could return row
> 1,3 and 4 based on these conditions?
select distinct
t1.textkey,
if(t2.textid,t2.languageid,t3.languageid) as languageid,
if(t2.textid,t2.textid,t3.textid) as textid,
if(t2.textid,t2.textvalue,t3.textvalue) as textvalue
from texts t1
left join texts t2 on
t2.textkey=t1.textkey and
t2.languageid='da'
left join texts t3 on
t3.textkey=t1.textkey and
t3.languageid='en';
I don't know if you always have at least one of 'da' or 'en' for every
possible textkey, and what behaviour you would like if you don't. If you
always have at least one of them, the statement could be simplified.
The above query will return languageid, textid and textvalue for every
textkey in the table, including those without 'da' or 'en', for which NULL
values are returned. You could add a where clause and test on the t1 table
to decide which textkey rows you wanted: "... where t1.languageid in
('en','da');" or maybe "... where t1.textkey = 'kb1';".
You should consider an index on the textkey field if this table could be/is
big.
hth,
--
Roger
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