聚合函数的 FILTER 子句
已记录的来源状态与原始语言说明；缺少版本证据时明确标为未知。
来源快照记录 PostgreSQL 8.1–18 的变化节点；历史矩阵独立记录 7.4–18 的状态。两者均未记录 PostgreSQL 19 或 20 的支持状态，较新版本明确保留为未知。这些来源声明与运行测量相互独立。
自定义函数、存储过程和触发器
说明
聚合函数现在可以使用 FILTER 子句进行过滤。例如：count(col_a) FILTER (WHERE col_b > 5)
所选版本: PostgreSQL 18
不支持
比较版本
原始文档链接
相关来源快照条目 · 此关系来自原始来源；两组矩阵各自保留独立状态。
完整来源事实与出处
legacy · center · b355381ecb09d4ce4e6de9bd96e57eaad9288a10de33658a435f1c47ac229b98
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