π Turbocharge Your Queries with COUNT DISTINCT: A Clever Data Dump Hack
SQL COUNT DISTINCT has been slow. It is, in essence, a grouping operation, which keeps traversed grouping field values for later comparisons. When the result set is too large, the data needs to be written to the hard disk and buffered, resulting in low performance.If data is sorted by the deduplicat...
π ΠΠΎΠ΄ΡΠΎΠ±Π½Π΅Π΅: https://www.roastdev.com/p...
SQL COUNT DISTINCT has been slow. It is, in essence, a grouping operation, which keeps traversed grouping field values for later comparisons. When the result set is too large, the data needs to be written to the hard disk and buffered, resulting in low performance.If data is sorted by the deduplicat...
π ΠΠΎΠ΄ΡΠΎΠ±Π½Π΅Π΅: https://www.roastdev.com/p...
Turbocharge Your Queries with COUNT DISTINCT: A Clever Data Dump Hack
SQL COUNT DISTINCT has been slow. It is, in essence, a grouping operation, which keeps traversed grouping field values for later comparisons. When the result set is too large, the data needs to be wri...
https://www.roastdev.com/post/turbocharge-your-queries-with-count-distinct-a-clever-data-dump-hack
22 days ago
