sql - alternate use of the CASE on table UPDATE -


this works:

update keyboard_learning set a.date_completed = case when a.date_completed = '04-jul-2012' '06-jul-2012' end a.emplid = 18

but won't(below). error datatypes don't match, , of course makes sense because 1 date datatype , other number.

update keyboard_learning set a.date_completed = case a.date_completed when '04-jul-2012' '06-jul-2012' end a.emplid = 21

my question: there workaround make second way work place column name 'a.date_completed' in case line of sql instead of how got working first way? off on syntax second sql?

convert date_completed string in case statement.

try this:

update keyboard_learning set a.date_completed = case to_char(a.date_completed, 'dd-mon-rrrr') when '04-jul-2012' to_date('06-jul-2012','dd-mon-rrrr') end a.emplid = 21

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