I am new to PostgreSQL. My case is that I have a table where I store my data. The data come from a file as one row and are getting saved in the database as 5 rows. What I want is to make a SELECT statement where it will combine the 5 rows again into one.
eg
id id2 id3 year code value
4 1 1 1642 radio 30
4 1 1 1642 tv 56
4 1 1 1642 cable 67
4 1 1 1642 dine 70
I want to have a query where it will return the following:
id id2 id3 year radio tv cable dine
4 1 1 1642 30 56 67 70
The values of the code are becoming columns with values the actual values.
Is this possible?
You could use ( SQL Fiddle ):
SELECT m.id, m.id2, m.id3, m.year,
SUM(CASE WHEN m.code = 'radio' THEN m.value END) as radio,
SUM(CASE WHEN m.code = 'tv' THEN m.value END) as tv,
SUM(CASE WHEN m.code = 'cable' THEN m.value END) as cable,
SUM(CASE WHEN m.code = 'dine' THEN m.value END) as dine
FROM MyTable m
GROUP BY m.id, m.id2, m.id3, m.year
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