Question

Postgres的新手，使用v9.3，想要利用hstore。

当我尝试连接两个hstore值时，我得到一个奇怪的错误：

SELECT p.properties->'name' || p.properties->'age' FROM people p where p.id=1;

错误是：

ERROR:  operator does not exist: text -> unknown
LINE 1: select n.properties->'name' || n.properties->'age' from n...
                                                   ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.

我也尝试了这一点，并不重要：

SELECT p.properties->'name'::text || p.properties->'age'::text FROM people p where p.id=1;

但是，我可以做

SELECT p.properties->'name' FROM people p where p.id=1;

SELECT p.properties->'age' FROM people p where p.id=1;

是否无法将两个hstore值连接到同一个hstore中？

任何指示赞赏！

Answer 1

您可以按原样执行 CAST 功能：

SELECT CAST(p.properties->'name' AS text) || CAST(p.properties->'age' AS text) FROM people p where p.id=1;

hstore：无法连接两个hstore值

1 个答案: