Someone asked me to quickly write them some code in any language that would accomplish a certain task. The following, which is in PostgreSQL, is the second solution that I came up with after doing the first one in my favorite language, JavaScript:
SELECT ARRAY_TO_STRING(ARRAY(
SELECT CHR(num
+ CASE
WHEN num < 26 THEN 65
WHEN num BETWEEN 26 AND 51 THEN 71
ELSE -4
END
)
FROM (
SELECT FLOOR(RANDOM() * 62)::INT AS num,
generate_series(1, 12)
) AS t
), '')
The question is, what does this SELECT
statement actually do? If you were asked to write that as a JavaScript, substituting the 12 for a variable passed into the function, what would your function look like?
As usual, the answer to this Problem of the Week will be made available a week from today, on Wednesday, August 22, 2012.
The answer to this Problem of the Week can now be found here.
1 Comment
POW Answer – Explain That SQL #1 | Chris West's Blog · August 24, 2012 at 4:39 PM
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