SELECT AVG(MY_AE_Actual) FROM MY_Data_Details
导致错误:
错误:列“my_ae_actual”不存在第 1 行:SELECT AVG(MY_AE_Actual) FROM MY_Data_Details ^ 提示:也许您的意思是引用列“my_data_details.my_ae_actual111”。********** 费勒 **********
错误:列“my_ae_actual”不存在 SQL 状态:42703 提示:也许您的意思是引用列“my_data_details.my_ae_actual111”。蔡晨:12
更新
这很奇怪。我现在在 PostgreSQL 10 中使用下表进行了测试:
CREATE TABLE public.testable
(
id integer NOT NULL DEFAULT nextval('testable_id_seq'::regclass),
string_data1 character varying(255) COLLATE pg_catalog."default",
"String_Data2" character varying(255) COLLATE pg_catalog."default",
"string_Data3" character varying(255) COLLATE pg_catalog."default",
"String_data4" character varying(255) COLLATE pg_catalog."default",
CONSTRAINT testable_pkey PRIMARY KEY (id)
)
select string_data1 from testable
- 成功
select String_data1 from testable
- 成功
select string_Data1 from testable
- 成功
select String_Data1 from testable
- 成功
select "string_data1" from testable
- 成功
select "String_data1" from testable
- 失败
select "string_Data1" from testable
- 失败
select "String_Data1" from testable
- 失败
select string_data2 from testable
- 失败
select String_data2 from testable
- 失败
select string_Data2 from testable
- 失败
select String_Data2 from testable
- 失败
select "string_data2" from testable
- 失败
select "String_data2" from testable
- 失败
select "string_Data2" from testable
- 失败
select "String_Data2" from testable
- 成功
事实证明,没有引号的 PostgreSQL 不是“不区分大小写”,而是“小写”,这根本没有意义。