sql server - Appending charactes to a string when duplicate found -


say have table of ids, names , field flag update follows:

+----+-------+---------+ | id | name  | update? | +----+-------+---------+ |  1 |     | y       | |  2 | b     | y       | |  3 | xxb   |         | |  4 | c     |         | |  5 | d     | y       | |  6 | xxd   |         | |  7 | xxxd  |         | |  8 | e     |         | +----+-------+---------+

the 'update' append 'xx' name, there cannot duplicate names in table i'd append additional 'x' duplicates found. 1 table update this:

+----+-------+---------+ | id | name  | update? | +----+-------+---------+ |  1 | xxa   |         | |  2 | xxb   |         | |  3 | xxxb  |         | |  4 | c     |         | |  5 | xxd   |         | |  6 | xxxd  |         | |  7 | xxxxd |         | |  8 | e     |         | +----+-------+---------+

any ideas on best way this? updating of duplicates occur initial update i'm stuck on, , i'm not sure how easy have check on , update levels of duplication, eg no duplicate, b 1 level, d 2 levels etc.

thanks, dave

try one:

sql fiddle

with cteupdate as(     select *,          base = replace(name, 'x', ''),         xxname = replicate('x',                      row_number() over(                         partition replace(name, 'x', '')                          order id                     ) + 1                 ) + replace(name, 'x', '')     testdata             replace(name, 'x', '') in(             select name testdata [update] = 1         ) ) update cteupdate      set name = xxname         , [update] = 0

result:

id          name       update ----------- ---------- ------ 1           xxa        0 2           xxb        0 3           xxxb       0 4           c          0 5           xxd        0 6           xxxd       0 7           xxxxd      0 8           e          0

first, want rows have same base name (the name minus xxs) rows update = 1. base name, replace x '':

select *,      base = replace(name, 'x', '') testdata     replace(name, 'x', '') in(         select name testdata [update] = 1     )

the result of above be:

id          name       update base ----------- ---------- ------ ------ 1                    1      2           b          1      b 3           xxb        0      b 5           d          1      d 6           xxd        0      d 7           xxxd       0      d

then, want use row_number over(partition base order id). resulting row_number + 1 number of xs added on base

with cteupdate as(     select *,          base = cast(replace(name, 'x', '') varchar(1))     testdata             replace(name, 'x', '') in(             select name testdata [update] = 1         ) ) select     rn = row_number() over(partition base order id),     xxname = replicate('x', row_number() over(partition base order id) + 1) + base cteupdate

the result of query above be:

id          name       update base   rn    xxname ----------- ---------- ------ ------ ----- --------- 1                    1           1     xxa 2           b          1      b      1     xxb 3           xxb        0      b      2     xxxb 5           d          1      d      1     xxd 6           xxd        0      d      2     xxxd 7           xxxd       0      d      3     xxxxd

the xxname updated name.


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