sql server - T-SQL setting int on a column based on random p-key -


i created following script below. pretty looking update colomn called "c1int" number 1234567 randomly based on pkey of row.

i created random generator pkey uses 1 min , total rows max.

then there loop should update rows on , on based on number in while statement. when run it, updates 1 random row 1234567 number , though still running loop, never updates else. missing something? there better way this?

declare @a int  declare @maxpkey int declare @minpkey int declare @randompkey int  set @a = 1 set @maxpkey = (select count(*) [loadtesttwo].[dbo].[actbenchdb.table1]) set @minpkey = 1 set @randompkey = round(((@maxpkey - @minpkey -1) * rand() + @minpkey),0)   while @a < 500000000000000000000   begin update [loadtesttwo].[dbo].[actbenchdb.table1] set    c1int = (1234567)  pkey = @randompkey  set @a = @a + 1 end

your current loop updates single row because set random key outside loop , run same update statement 500,000,000,000,000,000,000 times (which assuming 1 million executions per second still take 15 million years complete, , hit records anyway).

it clear trying do, don't know why want randomly change data in database. anyway, may not understand why, can @ least how, if want update n random rows, rather running loop n times, better perform single update:

declare @n int = 100; -- number of random rows update  update t  set cint = 12345467  (  select top (@n) *          [loadtesttwo].[dbo].[actbenchdb.table1]          order newid()     ) t;

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