CREATE TRIGGER 的 WHEN 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
添加对布尔表达式的支持，用于检查触发器是否应该被触发
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 · 4fe62bb350a53cd038b39b3d44a09a517b6915f04ce06826d94a9421d1977f0d
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