mySQL两次连接同一个表

Question

我正在尝试这个:

select 
audit_log_entries.created_at,
audit_log_orig_term_types.name as originator,
audit_log_orig_term_types.name as terminator
from audit_log_entries 
join audit_log_orig_term_types on audit_log_entries.originator_type_id = audit_log_orig_term_types.id
join audit_log_orig_term_types on audit_log_entries.terminator_type_id = audit_log_orig_term_types.id;

我认为意图很明确，我想要发起者和终结者的名字。我在第一个表中有他们的 ID，在另一个表中有他们的名字。

我收到一个错误:ERROR 1066 (42000): Not unique table/alias: 'audit_log_orig_term_types'

语法错误在哪里？

Answer 1

你可以这样:

select 
 audit_log_entries.created_at,
 audit1.name as originator,
 audit2.name as terminator
from audit_log_entries 
 join audit_log_orig_term_types audit1 on audit_log_entries.originator_type_id = audit1.id
 join audit_log_orig_term_types audit2 on audit_log_entries.terminator_type_id = audit2.id;