postgresql - Simple stored procedure-like function in PostgreSQL?

Question

I want to create a function in pgsql that will take three parameters and return a single value (1 row, 1 col).

I have the query working but can not seem to find a proper example of creating a function to do this.

Answer 1

看看这个页面上的例子，或者这个。

如果您实际阅读文档，则会有各种函数和返回类型的多个示例。