相关疑难解决方法(0)

我有一个未使用现有索引的查询，我不明白为什么。

桌子：

mustang=# \d+ bss.amplifier_saturation
                                               Table "bss.amplifier_saturation"
 Column |           Type           |                             Modifiers                             | Storage | Description 
--------+--------------------------+-------------------------------------------------------------------+---------+-------------
 value  | integer                  | not null                                                          | plain   | 
 target | integer                  | not null                                                          | plain   | 
 start  | timestamp with time zone | not null                                                          | plain   | 
 end    | timestamp with time zone | not null                                                          | plain   | 
 id     | integer                  | not null default nextval('amplifier_saturation_id_seq'::regclass) | plain   | 
 lddate | timestamp with time zone | not null default …