sql - 如何根据字符串 id 删除 PostgreSQL 数据库中的多行？

Question

所以我有下表:

qliu=# select id from api_member;
 id  
-----
 242
 236
 246
 251
 253
 9
 21
 185
 49
 188

我希望能够使用如下命令删除具有一系列 id 的行:

delete from api_member where id between '0' and '10';

但它什么也没有删除。另外如果你想知道

delete from api_member where id between 0 and 10;

我收到以下错误:

ERROR:  operator does not exist: character varying >= integer
LINE 1: delete from api_member where id between 0 and 10;
                                        ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.

Answer 1

这是因为您的列的 id 是 varchar 类型，而不是整数。您可以通过将其转换为 integer 来解决此问题，如下所示:

delete from api_member
where CAST(id as integer) between 0 and 10;

如果行数很大，这个操作可能会太慢。考虑将 id 列的类型更改为数字类型。