Question

有没有办法在postgresql表中添加约束以防止日期重叠？例如，我有一个名为workouts的表，其日期列为week_start，week_end。我想确保week_start - week_end范围都不与任何现有范围重叠。但是，week_start的结束日期可能会与week_end的开始日期重叠。

有人可以帮忙吗？

提前致谢！

Answer 1

您可以exclusion constraint使用overlap operator (&&)的daterange type执行此操作：

CREATE TABLE workouts (
  week_start DATE,
  week_end DATE,
  EXCLUDE USING gist (daterange(week_start, week_end) WITH &&)
)

Answer 2

您可以在表定义中添加EXCLUDE表约束，然后使用范围来检测重叠。如果您可以更改表格定义以将列week_start和week_end转换为单个范围，例如weeks，那么这将非常有用。

CREATE TABLE workouts (
  ...
  weeks   intrange
  EXCLUDE USING gist (weeks WITH &&)
);

防止日期重叠postgresql

2 个答案: