时态约束
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。
数据定义语言 (DDL)
说明
时态约束是作用于时间范围的约束，既可用于 PRIMARY KEY，也可用于 UNIQUE 约束。
所选版本: PostgreSQL 18
支持
比较版本
原始文档链接
完整来源事实与出处
yaml · center · 1dd22bf9a7f3ec325b894e2836fda535a25529f246a94dd41d6abbfe9997f7fd
{
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"Title": "Temporal constraints",
"BodyHTML": "\u003cp\u003eTemporal constraints are constraints over ranges. These are available for both \u003ca href=\"https://www.postgresql.org/docs/18/sql-createtable.html#SQL-CREATETABLE-PARMS-PRIMARY-KEY\" rel=\"nofollow\"\u003e\u003ccode\u003ePRIMARY KEY\u003c/code\u003e\u003c/a\u003e and \u003ca href=\"https://www.postgresql.org/docs/18/sql-createtable.html#SQL-CREATETABLE-PARMS-UNIQUE\" rel=\"nofollow\"\u003e\u003ccode\u003eUNIQUE\u003c/code\u003e\u003c/a\u003e constraints using the \u003ccode\u003eWITHOUT OVERLAPS\u003c/code\u003e clause, and \u003ca href=\"https://www.postgresql.org/docs/18/sql-createtable.html#SQL-CREATETABLE-PARMS-REFERENCES\" rel=\"nofollow\"\u003e\u003ccode\u003eFOREIGN KEY\u003c/code\u003e\u003c/a\u003e constraints using the \u003ccode\u003ePERIOD\u003c/code\u003e clause.\u003c/p\u003e\n",
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{
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"Title": "时态约束",
"BodyHTML": "\u003cp\u003e时态约束是作用于时间范围的约束，既可用于 \u003ccode\u003ePRIMARY KEY\u003c/code\u003e，也可用于 \u003ccode\u003eUNIQUE\u003c/code\u003e 约束。\u003c/p\u003e\n",
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}