sql server - Sql find Row with longest String and delete the Rest -


i working on table approx. 7.5mio rows , 16 columns. 1 of rows internal identifier (let's call id) use @ university. column contains string.

so, id not unique index row, possible 1 identifier appears more once in table - difference between 2 rows being string.

i need find rows id , keep 1 longest string , deleting every other row original table. unfortunately more of sql novice, , stuck @ point. if help, nice.

take @ sample:

select * #sample (values     (1, 'a'),     (1,'long a'),     (2,'b'),     (2,'long b'),     (2,'bb') ) t(id,txt)  delete s (     select *, row_number() on (partition id order len(txt) desc) rn     #sample) s rn!=1  select * #sample

results:

id  txt --  ------ 1   long 2   long b

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