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IBM AS400 DB2 SQL Tricks

Posted 02-08-2013 at 10:20 AM by NullTerminator

set schema mySchema

Select x,y,z from w
fetch first 20 rows only

reset an auto counter that got hosed
alter table T alter TheColumn restart with 123

grab the first non null value
select a,b,c, coalesce(z,y,z) as FirstGoodValue from T

Case
select A, case when x < 0 then 'Negative' else 'Positive' end from T

TIMESTAMP format is 'YYYY-MM-DD-hh.mm.ss.uuuuuu'

get month from a date MONTH(datefield), YEAR(datefield)
Date spans
select a,b,c from T
where SomeDate > CURRENT DATE - 2 MONTH

SELECT CURRENT DATE - 1 MONTH + 2 DAYS FROM MyTable
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