克劳德拉的条件条款

Question

我正试图在cloudera中使用if，then子句 - 行：

    if (appointment_purpose = '') and 
appointment_purpose2 = '') and 
appointment_type2 = '') and 
appointment_type3 = '') and 
appointment_type4 = '') and 
appointment_type5 = '') and 
discuss_other ' ') then
discuss_other = 0
else discuss_other = 1,

我如何让它工作？ 如果所有约会类型和约会目的都是空的，那么discuss_other也应该是空的，即0 - 否则discuss_other应该是1

Answer 1

试试这个：

SELECT (CASE WHEN appointment_purpose = '' 
AND appointment_purpose2 = ''
AND appointment_type2 = ''
AND appointment_type3 = ''
AND appointment_type4 = ''
AND appointment_type5 = ''
AND discuss_other ' '
THEN 0
ELSE 1
) as discuss_other
FROM tableName

Answer 2

在SQL中，＆＃34;空＆＃34;通常意味着*。所以，我想知道你是否真的打算使用其中一个结构：

NULL

因为其中一个值有空格，我想知道你是否要同时处理空格和空值：

select (case when appointment_purpose is null and
                  appointment_purpose2 is null and
                  appointment_type2 is null and
                  appointment_type3 is null and
                  appointment_type4 is null and
                  appointment_type5 is null and
                  discuss_other is null
             then 0 else 1
        end) as discuss_other

最后，同一个表中像数组一样的多个列通常是一个不好的标志。通常，这表明您需要联结表。