first_last_agg

first() 与 last() 聚合函数

概览

扩展包名	版本	分类	许可证	语言
`first_last_agg`	`0.1.4`	FUNC	PostgreSQL	C

ID	扩展名	Bin	Lib	Load	Create	Trust	Reloc	模式
4710	`first_last_agg`	否	是	否	是	否	是	-

相关扩展	`tablefunc` `extra_window_functions` `pg_duckdb` `argm` `pg_lake` `duckdb_fdw`

版本

类型	仓库	版本	PG 大版本	包名	依赖
EXT	MIXED	`0.1.4`	1817161514	`first_last_agg`	-
RPM	PIGSTY	`0.1.4`	1817161514	`first_last_agg_$v`	-
DEB	PGDG	`0.1.4`	1817161514	`postgresql-$v-first-last-agg`	-

OS / PG	PG18	PG17	PG16	PG15	PG14
el8.x86_64	PIGSTY 0.1.4 el8.x86_64.pg18 : first_last_agg_18 first_last_agg_18-0.1.4-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el8.x86_64.pg17 : first_last_agg_17 first_last_agg_17-0.1.4-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el8.x86_64.pg16 : first_last_agg_16 first_last_agg_16-0.1.4-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el8.x86_64.pg15 : first_last_agg_15 first_last_agg_15-0.1.4-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el8.x86_64.pg14 : first_last_agg_14 first_last_agg_14-0.1.4-1PIGSTY.el8.x86_64.rpm PIGSTY · 0.1.4 · 11.7KiB
el8.aarch64	PIGSTY 0.1.4 el8.aarch64.pg18 : first_last_agg_18 first_last_agg_18-0.1.4-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.1.4 · 12.0KiB	PIGSTY 0.1.4 el8.aarch64.pg17 : first_last_agg_17 first_last_agg_17-0.1.4-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.1.4 · 12.0KiB	PIGSTY 0.1.4 el8.aarch64.pg16 : first_last_agg_16 first_last_agg_16-0.1.4-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.1.4 · 12.0KiB	PIGSTY 0.1.4 el8.aarch64.pg15 : first_last_agg_15 first_last_agg_15-0.1.4-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.1.4 · 12.0KiB	PIGSTY 0.1.4 el8.aarch64.pg14 : first_last_agg_14 first_last_agg_14-0.1.4-1PIGSTY.el8.aarch64.rpm PIGSTY · 0.1.4 · 12.0KiB
el9.x86_64	PIGSTY 0.1.4 el9.x86_64.pg18 : first_last_agg_18 first_last_agg_18-0.1.4-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el9.x86_64.pg17 : first_last_agg_17 first_last_agg_17-0.1.4-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el9.x86_64.pg16 : first_last_agg_16 first_last_agg_16-0.1.4-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el9.x86_64.pg15 : first_last_agg_15 first_last_agg_15-0.1.4-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el9.x86_64.pg14 : first_last_agg_14 first_last_agg_14-0.1.4-1PIGSTY.el9.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB
el9.aarch64	PIGSTY 0.1.4 el9.aarch64.pg18 : first_last_agg_18 first_last_agg_18-0.1.4-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.1.4 · 11.5KiB	PIGSTY 0.1.4 el9.aarch64.pg17 : first_last_agg_17 first_last_agg_17-0.1.4-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.1.4 · 11.5KiB	PIGSTY 0.1.4 el9.aarch64.pg16 : first_last_agg_16 first_last_agg_16-0.1.4-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.1.4 · 11.5KiB	PIGSTY 0.1.4 el9.aarch64.pg15 : first_last_agg_15 first_last_agg_15-0.1.4-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.1.4 · 11.5KiB	PIGSTY 0.1.4 el9.aarch64.pg14 : first_last_agg_14 first_last_agg_14-0.1.4-1PIGSTY.el9.aarch64.rpm PIGSTY · 0.1.4 · 11.5KiB
el10.x86_64	PIGSTY 0.1.4 el10.x86_64.pg18 : first_last_agg_18 first_last_agg_18-0.1.4-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el10.x86_64.pg17 : first_last_agg_17 first_last_agg_17-0.1.4-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el10.x86_64.pg16 : first_last_agg_16 first_last_agg_16-0.1.4-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el10.x86_64.pg15 : first_last_agg_15 first_last_agg_15-0.1.4-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB	PIGSTY 0.1.4 el10.x86_64.pg14 : first_last_agg_14 first_last_agg_14-0.1.4-1PIGSTY.el10.x86_64.rpm PIGSTY · 0.1.4 · 11.4KiB
el10.aarch64	PIGSTY 0.1.4 el10.aarch64.pg18 : first_last_agg_18 first_last_agg_18-0.1.4-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el10.aarch64.pg17 : first_last_agg_17 first_last_agg_17-0.1.4-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el10.aarch64.pg16 : first_last_agg_16 first_last_agg_16-0.1.4-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el10.aarch64.pg15 : first_last_agg_15 first_last_agg_15-0.1.4-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.1.4 · 11.7KiB	PIGSTY 0.1.4 el10.aarch64.pg14 : first_last_agg_14 first_last_agg_14-0.1.4-1PIGSTY.el10.aarch64.rpm PIGSTY · 0.1.4 · 11.6KiB
d12.x86_64	PGDG 0.1.4 d12.x86_64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d12.x86_64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d12.x86_64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d12.x86_64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d12.x86_64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_amd64.deb PGDG · 0.1.4 · 8.5KiB
d12.aarch64	PGDG 0.1.4 d12.aarch64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d12.aarch64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d12.aarch64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d12.aarch64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d12.aarch64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg12+1_arm64.deb PGDG · 0.1.4 · 8.4KiB
d13.x86_64	PGDG 0.1.4 d13.x86_64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d13.x86_64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d13.x86_64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d13.x86_64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 d13.x86_64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_amd64.deb PGDG · 0.1.4 · 8.5KiB
d13.aarch64	PGDG 0.1.4 d13.aarch64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d13.aarch64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d13.aarch64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d13.aarch64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 d13.aarch64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg13+1_arm64.deb PGDG · 0.1.4 · 8.5KiB
u22.x86_64	PGDG 0.1.4 u22.x86_64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_amd64.deb PGDG · 0.1.4 · 8.4KiB	PGDG 0.1.4 u22.x86_64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_amd64.deb PGDG · 0.1.4 · 8.4KiB	PGDG 0.1.4 u22.x86_64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_amd64.deb PGDG · 0.1.4 · 8.4KiB	PGDG 0.1.4 u22.x86_64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_amd64.deb PGDG · 0.1.4 · 8.4KiB	PGDG 0.1.4 u22.x86_64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_amd64.deb PGDG · 0.1.4 · 8.4KiB
u22.aarch64	PGDG 0.1.4 u22.aarch64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u22.aarch64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_arm64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u22.aarch64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_arm64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u22.aarch64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_arm64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u22.aarch64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg22.04+1_arm64.deb PGDG · 0.1.4 · 8.6KiB
u24.x86_64	PGDG 0.1.4 u24.x86_64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u24.x86_64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u24.x86_64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u24.x86_64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u24.x86_64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB
u24.aarch64	PGDG 0.1.4 u24.aarch64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u24.aarch64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u24.aarch64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u24.aarch64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_arm64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u24.aarch64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg24.04+1_arm64.deb PGDG · 0.1.4 · 8.5KiB
u26.x86_64	PGDG 0.1.4 u26.x86_64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_amd64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u26.x86_64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u26.x86_64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_amd64.deb PGDG · 0.1.4 · 8.6KiB	PGDG 0.1.4 u26.x86_64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_amd64.deb PGDG · 0.1.4 · 8.5KiB	PGDG 0.1.4 u26.x86_64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_amd64.deb PGDG · 0.1.4 · 8.5KiB
u26.aarch64	PGDG 0.1.4 u26.aarch64.pg18 : postgresql-18-first-last-agg postgresql-18-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_arm64.deb PGDG · 0.1.4 · 8.9KiB	PGDG 0.1.4 u26.aarch64.pg17 : postgresql-17-first-last-agg postgresql-17-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_arm64.deb PGDG · 0.1.4 · 8.9KiB	PGDG 0.1.4 u26.aarch64.pg16 : postgresql-16-first-last-agg postgresql-16-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_arm64.deb PGDG · 0.1.4 · 8.9KiB	PGDG 0.1.4 u26.aarch64.pg15 : postgresql-15-first-last-agg postgresql-15-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_arm64.deb PGDG · 0.1.4 · 8.9KiB	PGDG 0.1.4 u26.aarch64.pg14 : postgresql-14-first-last-agg postgresql-14-first-last-agg_0.1.4-4-gd63ea3b-9.pgdg26.04+1_arm64.deb PGDG · 0.1.4 · 8.9KiB

构建

您可以使用 pig build 命令构建 first_last_agg 扩展的 RPM 包：

BASH

pig build pkg first_last_agg         # 构建 RPM 包

安装

您可以直接安装 first_last_agg 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：

BASH

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

BASH

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

pig

BASH

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

dnf

BASH

dnf install -y first_last_agg_18       # PG 18
dnf install -y first_last_agg_17       # PG 17
dnf install -y first_last_agg_16       # PG 16
dnf install -y first_last_agg_15       # PG 15
dnf install -y first_last_agg_14       # PG 14

apt

BASH

apt install -y postgresql-18-first-last-agg   # PG 18
apt install -y postgresql-17-first-last-agg   # PG 17
apt install -y postgresql-16-first-last-agg   # PG 16
apt install -y postgresql-15-first-last-agg   # PG 15
apt install -y postgresql-14-first-last-agg   # PG 14

创建扩展：

SQL

CREATE EXTENSION first_last_agg;

用法

first_last_agg: PostgreSQL 的 first 和 last 聚合函数

提供 first 和 last 聚合函数，返回分组中的第一个或最后一个值，适用于任意元素类型。

SQL

CREATE EXTENSION first_last_agg;

函数

函数	说明
`first(anyelement)`	返回分组中的第一个值
`last(anyelement)`	返回分组中的最后一个值

示例

SQL

-- 获取第一个和最后一个值（使用 ORDER BY 以获得确定性结果）
SELECT id, first(val ORDER BY ts), last(val ORDER BY ts)
FROM events
GROUP BY id;

-- 不使用 ORDER BY 时，分组内的顺序是不确定的
SELECT department, first(salary ORDER BY hire_date)
FROM employees
GROUP BY department;

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