如何使用SQL Server將多個查詢結果導出到csv？

Question

我設置了以下查詢：

SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z1'
SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z2'
SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z3'

如何一次導出所有這三個查詢的結果，以便最終的電子表格如下所示：

Zipfile  Count
--------------
z1        1200
z2        1350
z3       25500

Answer 1

您可以將所有3個查詢合並到一個查詢中：

SELECT
    SUM(CASE WHEN ZipFile = 'z1' THEN 1 ELSE 0 END) AS zip1_cnt,
    SUM(CASE WHEN ZipFile = 'z2' THEN 1 ELSE 0 END) AS zip2_cnt,
    SUM(CASE WHEN ZipFile = 'z3' THEN 1 ELSE 0 END) AS zip3_cnt
FROM SqlServer_tbl;

這會將三個計數中的每一個都放在單獨的列中。 如果您確實需要確切的輸出，則可以嘗試調整以上內容。 一種方法是將三個查詢合並在一起：

SELECT
    'z1' AS Zipfile,
    (SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z1') AS [Count]
FROM SqlServer_tbl
UNION ALL
SELECT 'z2', (SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z2')
FROM SqlServer_tbl
UNION ALL
SELECT 'z3', (SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z3')
FROM SqlServer_tbl

Answer 2

解決方案是：

SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z1'
Union
SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z2'
Union
SELECT COUNT(*) FROM SqlServer_tbl WHERE ZipFile = 'z3'

然后使用BCP命令將數據導出到CSV文件： https : //docs.microsoft.com/zh-cn/sql/tools/bcp-utility

Answer 3

您可以使用ZipFile列上的GROUP BY子句將三個查詢組合為一個查詢，如下所示：

SELECT ZipFile, COUNT(*) AS [Count]
FROM SqlServer_tbl 
WHERE ZipFile IN ('z1','z2','z3')
GROUP BY ZipFile
ORDER BY ZipFile

這將完全提供您要求的輸出。