SELECT TOP 10 ROWS IN SQL

Select from yourtable where yourPk in select top 10 percent yourPk from yourtable order by newid The cost of this will be the key scan of values plus the join cost which on a large table. In the case of a join query the rows locked are those that contribute to returned join rows.

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Select top 10 percent from yourtable order by newid In response to the pure trash comment concerning large tables.

. When FOR UPDATE or FOR SHARE appears at the top level of a SELECT query the rows that are locked are exactly those that are returned by the query. In addition rows that satisfied the query conditions as of the query snapshot will be locked although they will not be returned if they. You could do it like this to improve performance.

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