count_distinct

COUNT(DISTINCT …) 聚合的替代方案

概览

扩展包名	版本	分类	许可证	语言
`count_distinct`	`3.0.2`	FUNC	BSD-2-Clause	C

ID	扩展名	Bin	Lib	Load	Create	Trust	Reloc	模式
4630	`count_distinct`	否	是	否	是	否	是	-

相关扩展	`ddsketch` `tdigest` `topn` `omnisketch` `datasketches` `hll` `intagg` `intarray`

版本

类型	仓库	版本	PG 大版本	包名	依赖
EXT	PIGSTY	`3.0.2`	1817161514	`count_distinct`	-
RPM	PIGSTY	`3.0.2`	1817161514	`count_distinct_$v`	-
DEB	PIGSTY	`3.0.2`	1817161514	`postgresql-$v-count-distinct`	-

OS / PG	PG18	PG17	PG16	PG15	PG14
el8.x86_64	PIGSTY 3.0.2 el8.x86_64.pg18 : count_distinct_18 count_distinct_18-3.0.2-1PIGSTY.el8.x86_64.rpm PIGSTY · 3.0.2 · 16.8KiB count_distinct_18-3.0.2-1PGDG.rhel8.x86_64.rpm PGDG · 3.0.2 · 23.1KiB	PIGSTY 3.0.2 el8.x86_64.pg17 : count_distinct_17 count_distinct_17-3.0.2-1PIGSTY.el8.x86_64.rpm PIGSTY · 3.0.2 · 16.8KiB count_distinct_17-3.0.1-6PGDG.rhel8.x86_64.rpm PGDG · 3.0.1 · 20.7KiB	PIGSTY 3.0.2 el8.x86_64.pg16 : count_distinct_16 count_distinct_16-3.0.2-1PIGSTY.el8.x86_64.rpm PIGSTY · 3.0.2 · 16.8KiB count_distinct_16-3.0.1-5PGDG.rhel8.x86_64.rpm PGDG · 3.0.1 · 20.6KiB	PIGSTY 3.0.2 el8.x86_64.pg15 : count_distinct_15 count_distinct_15-3.0.2-1PIGSTY.el8.x86_64.rpm PIGSTY · 3.0.2 · 16.7KiB count_distinct_15-3.0.1-3.rhel8.x86_64.rpm PGDG · 3.0.1 · 31.7KiB	PIGSTY 3.0.2 el8.x86_64.pg14 : count_distinct_14 count_distinct_14-3.0.2-1PIGSTY.el8.x86_64.rpm PIGSTY · 3.0.2 · 16.7KiB count_distinct_14-3.0.1-3.rhel8.x86_64.rpm PGDG · 3.0.1 · 32.1KiB
el8.aarch64	PIGSTY 3.0.2 el8.aarch64.pg18 : count_distinct_18 count_distinct_18-3.0.2-1PIGSTY.el8.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_18-3.0.2-1PGDG.rhel8.aarch64.rpm PGDG · 3.0.2 · 22.8KiB	PIGSTY 3.0.2 el8.aarch64.pg17 : count_distinct_17 count_distinct_17-3.0.2-1PIGSTY.el8.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_17-3.0.1-6PGDG.rhel8.aarch64.rpm PGDG · 3.0.1 · 20.4KiB	PIGSTY 3.0.2 el8.aarch64.pg16 : count_distinct_16 count_distinct_16-3.0.2-1PIGSTY.el8.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_16-3.0.1-5PGDG.rhel8.aarch64.rpm PGDG · 3.0.1 · 20.3KiB	PIGSTY 3.0.2 el8.aarch64.pg15 : count_distinct_15 count_distinct_15-3.0.2-1PIGSTY.el8.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_15-3.0.1-3.rhel8.aarch64.rpm PGDG · 3.0.1 · 31.2KiB	PIGSTY 3.0.2 el8.aarch64.pg14 : count_distinct_14 count_distinct_14-3.0.2-1PIGSTY.el8.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_14-3.0.1-3.rhel8.aarch64.rpm PGDG · 3.0.1 · 31.1KiB
el9.x86_64	PGDG 3.0.2 el9.x86_64.pg18 : count_distinct_18 count_distinct_18-3.0.2-3PGDG.rhel9.8.x86_64.rpm PGDG · 3.0.2 · 22.9KiB count_distinct_18-3.0.2-1PIGSTY.el9.x86_64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_18-3.0.2-1PGDG.rhel9.x86_64.rpm PGDG · 3.0.2 · 22.9KiB	PGDG 3.0.2 el9.x86_64.pg17 : count_distinct_17 count_distinct_17-3.0.2-3PGDG.rhel9.8.x86_64.rpm PGDG · 3.0.2 · 22.8KiB count_distinct_17-3.0.2-1PIGSTY.el9.x86_64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_17-3.0.1-6PGDG.rhel9.x86_64.rpm PGDG · 3.0.1 · 20.6KiB	PGDG 3.0.2 el9.x86_64.pg16 : count_distinct_16 count_distinct_16-3.0.2-3PGDG.rhel9.8.x86_64.rpm PGDG · 3.0.2 · 22.8KiB count_distinct_16-3.0.2-1PIGSTY.el9.x86_64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_16-3.0.1-5PGDG.rhel9.x86_64.rpm PGDG · 3.0.1 · 20.4KiB	PGDG 3.0.2 el9.x86_64.pg15 : count_distinct_15 count_distinct_15-3.0.2-3PGDG.rhel9.8.x86_64.rpm PGDG · 3.0.2 · 22.8KiB count_distinct_15-3.0.2-1PIGSTY.el9.x86_64.rpm PIGSTY · 3.0.2 · 16.7KiB count_distinct_15-3.0.1-3.rhel9.x86_64.rpm PGDG · 3.0.1 · 32.4KiB	PGDG 3.0.2 el9.x86_64.pg14 : count_distinct_14 count_distinct_14-3.0.2-3PGDG.rhel9.8.x86_64.rpm PGDG · 3.0.2 · 22.8KiB count_distinct_14-3.0.2-1PIGSTY.el9.x86_64.rpm PIGSTY · 3.0.2 · 16.6KiB
el9.aarch64	PGDG 3.0.2 el9.aarch64.pg18 : count_distinct_18 count_distinct_18-3.0.2-3PGDG.rhel9.8.aarch64.rpm PGDG · 3.0.2 · 22.4KiB count_distinct_18-3.0.2-1PIGSTY.el9.aarch64.rpm PIGSTY · 3.0.2 · 16.5KiB count_distinct_18-3.0.2-1PGDG.rhel9.aarch64.rpm PGDG · 3.0.2 · 22.3KiB	PGDG 3.0.2 el9.aarch64.pg17 : count_distinct_17 count_distinct_17-3.0.2-3PGDG.rhel9.8.aarch64.rpm PGDG · 3.0.2 · 22.4KiB count_distinct_17-3.0.2-1PIGSTY.el9.aarch64.rpm PIGSTY · 3.0.2 · 16.5KiB count_distinct_17-3.0.1-6PGDG.rhel9.aarch64.rpm PGDG · 3.0.1 · 20.2KiB	PGDG 3.0.2 el9.aarch64.pg16 : count_distinct_16 count_distinct_16-3.0.2-3PGDG.rhel9.8.aarch64.rpm PGDG · 3.0.2 · 22.4KiB count_distinct_16-3.0.2-1PIGSTY.el9.aarch64.rpm PIGSTY · 3.0.2 · 16.5KiB count_distinct_16-3.0.1-5PGDG.rhel9.aarch64.rpm PGDG · 3.0.1 · 19.8KiB	PGDG 3.0.2 el9.aarch64.pg15 : count_distinct_15 count_distinct_15-3.0.2-3PGDG.rhel9.8.aarch64.rpm PGDG · 3.0.2 · 22.4KiB count_distinct_15-3.0.2-1PIGSTY.el9.aarch64.rpm PIGSTY · 3.0.2 · 16.4KiB count_distinct_15-3.0.1-3.rhel9.aarch64.rpm PGDG · 3.0.1 · 31.6KiB	PGDG 3.0.2 el9.aarch64.pg14 : count_distinct_14 count_distinct_14-3.0.2-3PGDG.rhel9.8.aarch64.rpm PGDG · 3.0.2 · 22.4KiB count_distinct_14-3.0.2-1PIGSTY.el9.aarch64.rpm PIGSTY · 3.0.2 · 16.4KiB count_distinct_14-3.0.1-3.rhel9.aarch64.rpm PGDG · 3.0.1 · 31.7KiB
el10.x86_64	PGDG 3.0.2 el10.x86_64.pg18 : count_distinct_18 count_distinct_18-3.0.2-3PGDG.rhel10.2.x86_64.rpm PGDG · 3.0.2 · 23.0KiB count_distinct_18-3.0.2-1PIGSTY.el10.x86_64.rpm PIGSTY · 3.0.2 · 16.7KiB count_distinct_18-3.0.2-1PGDG.rhel10.x86_64.rpm PGDG · 3.0.2 · 23.3KiB	PGDG 3.0.2 el10.x86_64.pg17 : count_distinct_17 count_distinct_17-3.0.2-3PGDG.rhel10.2.x86_64.rpm PGDG · 3.0.2 · 23.0KiB count_distinct_17-3.0.2-1PIGSTY.el10.x86_64.rpm PIGSTY · 3.0.2 · 16.7KiB count_distinct_17-3.0.2-1PGDG.rhel10.x86_64.rpm PGDG · 3.0.2 · 23.3KiB	PGDG 3.0.2 el10.x86_64.pg16 : count_distinct_16 count_distinct_16-3.0.2-3PGDG.rhel10.2.x86_64.rpm PGDG · 3.0.2 · 23.0KiB count_distinct_16-3.0.2-1PIGSTY.el10.x86_64.rpm PIGSTY · 3.0.2 · 16.7KiB count_distinct_16-3.0.2-1PGDG.rhel10.x86_64.rpm PGDG · 3.0.2 · 23.3KiB	PGDG 3.0.2 el10.x86_64.pg15 : count_distinct_15 count_distinct_15-3.0.2-3PGDG.rhel10.2.x86_64.rpm PGDG · 3.0.2 · 22.9KiB count_distinct_15-3.0.2-1PIGSTY.el10.x86_64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_15-3.0.2-1PGDG.rhel10.x86_64.rpm PGDG · 3.0.2 · 23.2KiB	PGDG 3.0.2 el10.x86_64.pg14 : count_distinct_14 count_distinct_14-3.0.2-3PGDG.rhel10.2.x86_64.rpm PGDG · 3.0.2 · 22.9KiB count_distinct_14-3.0.2-1PIGSTY.el10.x86_64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_14-3.0.2-1PGDG.rhel10.x86_64.rpm PGDG · 3.0.2 · 23.2KiB
el10.aarch64	PGDG 3.0.2 el10.aarch64.pg18 : count_distinct_18 count_distinct_18-3.0.2-3PGDG.rhel10.2.aarch64.rpm PGDG · 3.0.2 · 22.7KiB count_distinct_18-3.0.2-1PIGSTY.el10.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_18-3.0.2-1PGDG.rhel10.aarch64.rpm PGDG · 3.0.2 · 22.9KiB	PGDG 3.0.2 el10.aarch64.pg17 : count_distinct_17 count_distinct_17-3.0.2-3PGDG.rhel10.2.aarch64.rpm PGDG · 3.0.2 · 22.7KiB count_distinct_17-3.0.2-1PIGSTY.el10.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_17-3.0.2-1PGDG.rhel10.aarch64.rpm PGDG · 3.0.2 · 22.9KiB	PGDG 3.0.2 el10.aarch64.pg16 : count_distinct_16 count_distinct_16-3.0.2-3PGDG.rhel10.2.aarch64.rpm PGDG · 3.0.2 · 22.7KiB count_distinct_16-3.0.2-1PIGSTY.el10.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_16-3.0.2-1PGDG.rhel10.aarch64.rpm PGDG · 3.0.2 · 22.9KiB	PGDG 3.0.2 el10.aarch64.pg15 : count_distinct_15 count_distinct_15-3.0.2-3PGDG.rhel10.2.aarch64.rpm PGDG · 3.0.2 · 22.7KiB count_distinct_15-3.0.2-1PIGSTY.el10.aarch64.rpm PIGSTY · 3.0.2 · 16.6KiB count_distinct_15-3.0.2-1PGDG.rhel10.aarch64.rpm PGDG · 3.0.2 · 22.9KiB	PGDG 3.0.2 el10.aarch64.pg14 : count_distinct_14 count_distinct_14-3.0.2-3PGDG.rhel10.2.aarch64.rpm PGDG · 3.0.2 · 22.7KiB count_distinct_14-3.0.2-1PIGSTY.el10.aarch64.rpm PIGSTY · 3.0.2 · 16.5KiB count_distinct_14-3.0.2-1PGDG.rhel10.aarch64.rpm PGDG · 3.0.2 · 22.9KiB
d12.x86_64	PIGSTY 3.0.2 d12.x86_64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb PIGSTY · 3.0.2 · 34.8KiB	PIGSTY 3.0.2 d12.x86_64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb PIGSTY · 3.0.2 · 34.7KiB	PIGSTY 3.0.2 d12.x86_64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb PIGSTY · 3.0.2 · 34.7KiB	PIGSTY 3.0.2 d12.x86_64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb PIGSTY · 3.0.2 · 34.5KiB	PIGSTY 3.0.2 d12.x86_64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~bookworm_amd64.deb PIGSTY · 3.0.2 · 34.5KiB
d12.aarch64	PIGSTY 3.0.2 d12.aarch64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb PIGSTY · 3.0.2 · 34.6KiB	PIGSTY 3.0.2 d12.aarch64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb PIGSTY · 3.0.2 · 34.5KiB	PIGSTY 3.0.2 d12.aarch64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb PIGSTY · 3.0.2 · 34.5KiB	PIGSTY 3.0.2 d12.aarch64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb PIGSTY · 3.0.2 · 34.2KiB	PIGSTY 3.0.2 d12.aarch64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~bookworm_arm64.deb PIGSTY · 3.0.2 · 34.2KiB
d13.x86_64	PIGSTY 3.0.2 d13.x86_64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~trixie_amd64.deb PIGSTY · 3.0.2 · 34.8KiB	PIGSTY 3.0.2 d13.x86_64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~trixie_amd64.deb PIGSTY · 3.0.2 · 34.7KiB	PIGSTY 3.0.2 d13.x86_64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~trixie_amd64.deb PIGSTY · 3.0.2 · 34.7KiB	PIGSTY 3.0.2 d13.x86_64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~trixie_amd64.deb PIGSTY · 3.0.2 · 34.5KiB	PIGSTY 3.0.2 d13.x86_64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~trixie_amd64.deb PIGSTY · 3.0.2 · 34.5KiB
d13.aarch64	PIGSTY 3.0.2 d13.aarch64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~trixie_arm64.deb PIGSTY · 3.0.2 · 34.6KiB	PIGSTY 3.0.2 d13.aarch64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~trixie_arm64.deb PIGSTY · 3.0.2 · 34.5KiB	PIGSTY 3.0.2 d13.aarch64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~trixie_arm64.deb PIGSTY · 3.0.2 · 34.5KiB	PIGSTY 3.0.2 d13.aarch64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~trixie_arm64.deb PIGSTY · 3.0.2 · 34.3KiB	PIGSTY 3.0.2 d13.aarch64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~trixie_arm64.deb PIGSTY · 3.0.2 · 34.3KiB
u22.x86_64	PIGSTY 3.0.2 u22.x86_64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb PIGSTY · 3.0.2 · 36.4KiB	PIGSTY 3.0.2 u22.x86_64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb PIGSTY · 3.0.2 · 37.4KiB	PIGSTY 3.0.2 u22.x86_64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb PIGSTY · 3.0.2 · 37.4KiB	PIGSTY 3.0.2 u22.x86_64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb PIGSTY · 3.0.2 · 37.1KiB	PIGSTY 3.0.2 u22.x86_64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~jammy_amd64.deb PIGSTY · 3.0.2 · 37.0KiB
u22.aarch64	PIGSTY 3.0.2 u22.aarch64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb PIGSTY · 3.0.2 · 36.4KiB	PIGSTY 3.0.2 u22.aarch64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb PIGSTY · 3.0.2 · 37.3KiB	PIGSTY 3.0.2 u22.aarch64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb PIGSTY · 3.0.2 · 37.3KiB	PIGSTY 3.0.2 u22.aarch64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb PIGSTY · 3.0.2 · 37.1KiB	PIGSTY 3.0.2 u22.aarch64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~jammy_arm64.deb PIGSTY · 3.0.2 · 37.0KiB
u24.x86_64	PIGSTY 3.0.2 u24.x86_64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb PIGSTY · 3.0.2 · 35.8KiB	PIGSTY 3.0.2 u24.x86_64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb PIGSTY · 3.0.2 · 35.7KiB	PIGSTY 3.0.2 u24.x86_64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb PIGSTY · 3.0.2 · 35.7KiB	PIGSTY 3.0.2 u24.x86_64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb PIGSTY · 3.0.2 · 35.5KiB	PIGSTY 3.0.2 u24.x86_64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~noble_amd64.deb PIGSTY · 3.0.2 · 35.4KiB
u24.aarch64	PIGSTY 3.0.2 u24.aarch64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb PIGSTY · 3.0.2 · 35.7KiB	PIGSTY 3.0.2 u24.aarch64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb PIGSTY · 3.0.2 · 35.6KiB	PIGSTY 3.0.2 u24.aarch64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb PIGSTY · 3.0.2 · 35.6KiB	PIGSTY 3.0.2 u24.aarch64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb PIGSTY · 3.0.2 · 35.4KiB	PIGSTY 3.0.2 u24.aarch64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~noble_arm64.deb PIGSTY · 3.0.2 · 35.4KiB
u26.x86_64	PIGSTY 3.0.2 u26.x86_64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~resolute_amd64.deb PIGSTY · 3.0.2 · 35.4KiB	PIGSTY 3.0.2 u26.x86_64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~resolute_amd64.deb PIGSTY · 3.0.2 · 35.4KiB	PIGSTY 3.0.2 u26.x86_64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~resolute_amd64.deb PIGSTY · 3.0.2 · 35.4KiB	PIGSTY 3.0.2 u26.x86_64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~resolute_amd64.deb PIGSTY · 3.0.2 · 35.2KiB	PIGSTY 3.0.2 u26.x86_64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~resolute_amd64.deb PIGSTY · 3.0.2 · 35.1KiB
u26.aarch64	PIGSTY 3.0.2 u26.aarch64.pg18 : postgresql-18-count-distinct postgresql-18-count-distinct_3.0.2-1PIGSTY~resolute_arm64.deb PIGSTY · 3.0.2 · 35.7KiB	PIGSTY 3.0.2 u26.aarch64.pg17 : postgresql-17-count-distinct postgresql-17-count-distinct_3.0.2-1PIGSTY~resolute_arm64.deb PIGSTY · 3.0.2 · 35.6KiB	PIGSTY 3.0.2 u26.aarch64.pg16 : postgresql-16-count-distinct postgresql-16-count-distinct_3.0.2-1PIGSTY~resolute_arm64.deb PIGSTY · 3.0.2 · 35.6KiB	PIGSTY 3.0.2 u26.aarch64.pg15 : postgresql-15-count-distinct postgresql-15-count-distinct_3.0.2-1PIGSTY~resolute_arm64.deb PIGSTY · 3.0.2 · 35.4KiB	PIGSTY 3.0.2 u26.aarch64.pg14 : postgresql-14-count-distinct postgresql-14-count-distinct_3.0.2-1PIGSTY~resolute_arm64.deb PIGSTY · 3.0.2 · 35.3KiB

构建

您可以使用 pig build 命令构建 count_distinct 扩展的 RPM / DEB 包：

pig build pkg count_distinct         # 构建 RPM / DEB 包

安装

您可以直接安装 count_distinct 扩展包的预置二进制包，首先确保 PGDG 和 PIGSTY 仓库已经添加并启用：

pig repo add pgsql -u          # 添加仓库并更新缓存

使用 pig 或者是 apt/yum/dnf 安装扩展：

安装

pig install count_distinct;          # 当前活跃 PG 版本安装

pig

pig ext install -y count_distinct -v 18  # PG 18
pig ext install -y count_distinct -v 17  # PG 17
pig ext install -y count_distinct -v 16  # PG 16
pig ext install -y count_distinct -v 15  # PG 15
pig ext install -y count_distinct -v 14  # PG 14

dnf

dnf install -y count_distinct_18       # PG 18
dnf install -y count_distinct_17       # PG 17
dnf install -y count_distinct_16       # PG 16
dnf install -y count_distinct_15       # PG 15
dnf install -y count_distinct_14       # PG 14

apt

apt install -y postgresql-18-count-distinct   # PG 18
apt install -y postgresql-17-count-distinct   # PG 17
apt install -y postgresql-16-count-distinct   # PG 16
apt install -y postgresql-15-count-distinct   # PG 15
apt install -y postgresql-14-count-distinct   # PG 14

创建扩展：

CREATE EXTENSION count_distinct;

用法

来源：

提供 COUNT(DISTINCT ...) 的替代实现，避免排序并支持并行聚合。

CREATE EXTENSION count_distinct;

函数

函数	描述
`count_distinct(value anyelement)`	计算去重计数（`COUNT(DISTINCT ...)` 的替代方案）
`array_agg_distinct(value anyelement)`	将去重值聚合为数组
`count_distinct_elements(value anyarray)`	计算输入数组中去重元素的数量
`array_agg_distinct_elements(value anyarray)`	将输入数组中的去重元素聚合为数组

示例

CREATE TABLE test_table (id INT, val INT);
INSERT INTO test_table
SELECT mod(i, 1000), (1000 * random())::int
FROM generate_series(1, 10000) s(i);

-- Instead of:  SELECT id, COUNT(DISTINCT val) FROM test_table GROUP BY 1;
-- Use:
SELECT id, count_distinct(val) FROM test_table GROUP BY 1;

-- Aggregate distinct values into an array
SELECT id, array_agg_distinct(val) FROM test_table GROUP BY 1;

-- Count distinct elements across arrays
SELECT count_distinct_elements(ARRAY[1, 2, 2, 3]);

类型、内存与版本

3.0.2 接受按值传递的定长类型，例如整数，以及这些类型的数组；它不能普遍替代文本值的去重聚合。先对大值做哈希可能发生碰撞，因此会把结果变成估计值。这些聚合将状态保留在内存中，无法可靠执行 work_mem 限制；高基数或大量并发分组可能耗尽内存。应使用实际负载与内置聚合比较正确性、执行计划和内存，而不是预设它一定更快。控制文件允许重定位且无需预加载；安装 C 扩展通常需要超级用户。

count_distinct

概览

版本

构建

安装

用法

函数

示例

类型、内存与版本

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