HAVING Filters

HAVING FALSE Drops Groups

FALSE HAVING groups are dropped.

highlighted = computed this step

HAVING FALSE

A group whose HAVING predicate is FALSE is dropped.

FALSE group dropped\text{FALSE group dropped}

Read dropped groups

HAVING drops 1 FALSE group in this example.

FALSE groups=1\text{FALSE groups}=1

HAVING examples are tiny finite group-filter transforms; SQL dialect completeness, optimizer behavior, indexing, and product claims are out of scope.

HAVING FALSE drops groups: base rowsidregionstatusqty1eastopen22eastopen33westopen14westclosed45northNULL26northopen1 WHERE before groupingsourceinputwhereTruthgroupedRole0[1, east, open, 2]TRUEgrouped1[2, east, open, 3]TRUEgrouped2[3, west, open, 1]TRUEgrouped3[4, west, closed, 4]TRUEgrouped4[5, north, NULL, 2]TRUEgrouped5[6, north, open, 1]TRUEgrouped GROUP BY bucketskeysourceRowsrowCount[east][0, 1]2[west][2, 3]2[north][4, 5]2 Aggregate facts per groupkeysourceRowsaggregates[east][0, 1]{n:2, total_qty:5}[west][2, 3]{n:2, total_qty:5}[north][4, 5]{n:2, total_qty:3} HAVING result per groupkeypredicatetruthoutputRole[east]total_qty ge 5TRUEkept[west]total_qty ge 5TRUEkept[north]total_qty ge 5FALSEdropped HAVING output groupsregionntotal_qtyeast25west25 HAVING factsfactvalueinputRowCount6whereKeptRows6whereDroppedRows0groupCount3aggregateCount2outputGroupCount2havingTrueCount2havingFalseCount1havingUnknownCount0groupOrderfirst_seen_after_wherepipelineWHERE_before_GROUP_BY_then_HAVING

Dropped group still visible

The HAVING table still shows the group and its FALSE result.

drop is visible\text{drop is visible}

Summary

FALSE groups are absent from the final grouped output.

FALSE not output\text{FALSE not output}