Why might this query be taking nearly 2 hours to run when similar queries complete within a minute? CREATE TABLE T3 AS SELECT A.*, COALESCE(C.FIELD1,0) AS FIELD1A, ...
When doing a count (aggregate) SQL query, what can speed up the execution time in these 3 database systems? I'm sure many things could speed it up (hardware for one), but I'm just a novice DBA, so ...