[英]Values of columns in first table refer to column names in second table. How to pull the values from second table?
[英]How to select first not null value from a single column in a table.?
情況如下:
表:索償
數據:
Claim id ex-code SEQ_no
A1 1
A1 dvv 2
A1 abc 3
A2 xyz 1
A2 2
我想提取索賠ID和ex-code。.僅應使用ex-code的第一個非null值。.是否為此有任何功能,還是應該使用子查詢..?
對於MSSQL,請嘗試以下操作:
SELECT TOP 1 ClaimId, ExCode,SEQNo FROM Claim WHERE ExCode IS NOT NULL
SELECT top 1 * FROM [Claims] WHERE ex-code <> null
嘗試這個
SELECT claim_id, ex_code, seq_no
FROM Claims
WHERE ex_code NOT NULL
GROUP BY claim_id
ORDER BY claim_id
據我所知, GROUP BY
返回第一個值(除非使用GROUP_CONCAT
)。 所以這應該工作。
試試這個:該查詢明智地返回Claim ID優先記錄,該記錄不為null ...
WITH getFirstNonNull AS (
SELECT Claimid,ROW_NUMBER() OVER (PARTITION BY Claimid ORDER BY SEQ_no) AS RowNum , ex-code FROM Claims
WHERE ex-code IS NOT NULL
) SELECT * FROM getFirstNonNull WHERE RowNum = 1
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