Laboratory Control system for Engineering Cleanroom

For N < 100 execution time is less then 4ms (so isn't any reason for dirty trick). For bigger N is execution time different (SlowList(10000) - 4000ms, FastList(10000) - 52ms). Author - Pavel Stěhule. Use IS DISTINCT FROM without COALESCE. Sim Zacks reported slow queries after migration to 8.2.4. ................
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