如何使用SQL Server将多个查询结果导出到csv？

Question

我设置了以下查询：

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

如何一次导出所有这三个查询的结果，以便最终的电子表格如下所示：

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

Answer 1

您可以将所有3个查询合并到一个查询中：

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;

这会将三个计数中的每一个都放在单独的列中。 如果您确实需要确切的输出，则可以尝试调整以上内容。 一种方法是将三个查询合并在一起：

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

解决方案是：

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命令将数据导出到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子句将三个查询组合为一个查询，如下所示：

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

这将完全提供您要求的输出。