Hi The query: select * from webdata except select * from webdata1; takes abysmally long .How can I optimise it? The particulars are: tracedb=> \d webdata Table = webdata +----------------------------------+----------------------------------+-------+ | Field | Type | Length| +----------------------------------+----------------------------------+-------+ | tid | int4 | 4 | | itemid | int4 | 4 | | ordering | int4 | 4 | +----------------------------------+----------------------------------+-------+ tracedb=> \d webdata1 Table = webdata1 +----------------------------------+----------------------------------+-------+ | Field | Type | Length| +----------------------------------+----------------------------------+-------+ | tid | int4 | 4 | | itemid | int4 | 4 | | ordering | int4 | 4 | +----------------------------------+----------------------------------+-------+ tracedb=> select count(*) from webdata; count ----- 91155 (1 row) tracedb=> select count(*) from webdata1; count ----- 9550 (1 row) Regards Satya
pgsql-general by date:
Соглашаюсь с условиями обработки персональных данных