SQL to transpose row pairs to columns in MS ACCESS database
Question
I have an MS Access database that contains translated sentences in source-target pairs (a translation memory for fellow users of CAT tools). Somewhat annoyingly, source and target are not stored in separate columns, but in rows linked by ID, like this:
+---+----+--------------+
|id |lang| text |
+---+----+--------------+
1 a lang a text
1 b lang b text
2 a more a text...
2 b more b text...
+---+----+--------------+
What SQL could I use to turn that into a table such as:
+---+--------------+--------------+
|id | lang A | lang B |
+---+--------------+--------------+
1 lang a text lang b text
2 more a text... more b text...
Performance doesn't matter here, since would I only need to do this once in a while, and the db isn't huge (only a few thousand rows).
Solution
A crosstab query should suit.
TRANSFORM First([Text]) AS LangText
SELECT ID, First([Text])
FROM Table
GROUP BY ID
PIVOT lang
Further information: http://allenbrowne.com/ser-67.html
OTHER TIPS
You need a self-join:
SELECT
t1.id, t1.text AS lang_a, t2.text AS lang_b
FROM
lang_table AS t1
INNER JOIN
lang_table AS t2
ON
(t1.id = t2.id)
WHERE
t1.lang = 'a'
AND
t2.lang = 'b'
select a.id, a.text as 'lang A', b.text as 'lang B'
from table a join table b on (a.id = b.id)
where a.lang = 'a' and b.lang = 'b';
where "table" is whatever table these are in.
SELECT a.id,
MAX(CASE WHEN a.lang LIKE 'a' THEN a.text) AS Lang A,
MAX(CASE WHEN a.lang LIKE 'a' THEN a.text) AS Lang A
FROM table a
GROUP BY a.id
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