[英]Sql Bigquery - concat two columns into a new column
select if (
a_bill_id = b_bill_id,
a_bill_id,
concat(a_bill_id , ' ', b_bill_id )
) as bill_id
from your_table
... 顯示 null 值....
select if (
a_bill_id = b_bill_id or (a_bill_id = b_bill_id) is null,
coalesce(a_bill_id, b_bill_id),
concat(a_bill_id , ' ', b_bill_id )
) as bill_id
from your_table
您可以使用這樣的案例陳述 -
SELECT
case when A_Bill_ID = B_BILL_ID then a_bill_Id
else CONCAT(A_Bill_ID , ' ', B_BILL_ID )
end AS BILL_ID
FROM `table.tmp_140222`
如果初始列中有 Null 個值,您可以使用 IFNULL 或 COALEASE 將其替換為空字符串。 但在這種情況下,我建議在沒有分隔符的情況下使用它或編寫多個“when”語句以避免在最后一列中出現尾部空格 -
SELECT
case when A_Bill_ID = B_BILL_ID then a_bill_Id
else CONCAT(IFNULL(A_Bill_ID), ''), "", IFNULL(B_BILL_ID, ''))
end AS BILL_ID
FROM `table.tmp_140222`
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