Query a count of the number of cities in CITY having a Population larger than 100,000. DECLARE @tbl_CITY AS TABLE (ID int, [Name] varchar(17),CountryCode varchar(3),District varchar(20),[Population] ...
If you use the COUNT (* ) function on a big table, the query will be slow. This is related to the PostgreSQL MVCC implementation. Because multiple transactions see different states of data at the same ...
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