在PSQL v11中Where子句中的Concat两列

Question

SELECT CONCAT(rtrim(Xyz.FirstName), rtrim(Xyz.LastName)) as person from Xyz
WHERE Person = ('JohnSmith')

  

以上工作但我的输入参数中有一个空格   例子＆＃34; John Smith＆＃34;。我尝试添加

 WHERE Person = ltrim('John Smith')

但这也不起作用。

Answer 1

查询：

SELECT CONCAT(rtrim(Xyz.FirstName), rtrim(Xyz.LastName)) as person from Xyz
WHERE Person = ('Jon Smith')

由于空间而无法返回任何记录，而您rtrim字段 你可以使用类似的东西：

SELECT CONCAT(rtrim(Xyz.FirstName), concat(' ', rtrim(Xyz.LastName))) as person from Xyz
WHERE Person = ('Jon Smith')

请注意concat部分中的额外Select和空格（＆＃39;＆＃39;）。

Answer 2

就像这样：

select * from person where trim(last_name)||trim(first_name)= replace('John  Smith', ' ', '')