sql - Move Values into next Column -

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i have table (the structure fixed) contains 24 fields h0-h23 representing hours of day. in 1 of these columns there 'm'. once 'm' has been found (say in h13) want swap value in h13 value in h14 (the field next it) , swap value in h14 h13. in example (i have limited 6 fields clarity)

null, null, t, t, m, s, f

would change to

null, null, t, t, s, m, f

what efficient way this? thank you

note: understand update queries, main problem need find position of 'm' without doing 24 case statements if possible

as can't change data-structure, you're stuck lot of case statements...

update   yourtable set   h00 = case m_hour                  when 00 h01 else h00 end,   h01 = case m_hour when 00 h00 when 01 h02 else h01 end,   h02 = case m_hour when 01 h01 when 02 h03 else h02 end,   h03 = case m_hour when 02 h02 when 03 h04 else h03 end,   ...   h23 = case m_hour when 22 h22 when 23 ??? else h23 end (   select     primary_key,     case when h00 = 'm' 00          when h01 = 'm' 01          ...     end m_hour       yourtable )   lookup   lookup.primary_key = yourtable.primary_key


you shorten sub-query case doing instead:

charindex('m', h00 + h01 + h02 + ... + h23, 0) - 1   m_hour

but add cpu load price shortening code, , doesn't rid of 24 case statements in update.


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