Question

我试图在表格中找到“ - ”的数量，我正在使用此查询，但它无法正常工作

adapter.SelectCommand = new SqlCommand("select Count (*) from try
where DistrictName  = '-'  OR TownName  = '-'  
OR FarmerName = '-' OR Area = '-'"), con);*

此外，我如何将此查询转换为在每列中找到“ - ”的数字？

Answer 1

关于你的第二个问题：

SELECT
    SUM(CASE WHEN DistrictName  = '-' THEN 1 ELSE 0 END) Districts,
    SUM(CASE WHEN TownName  = '-' THEN 1 ELSE 0 END) Towns,
    SUM(CASE WHEN FarmerName = '-' THEN 1 ELSE 0 END) Farmers,
    SUM(CASE WHEN Area = '-' THEN 1 ELSE 0 END) Areas
FROM try

对于第一个问题，请尝试此操作以获取所有列中的连字符总数：

SELECT
    SUM((CASE WHEN DistrictName  = '-' THEN 1 ELSE 0 END) +
        (CASE WHEN TownName  = '-' THEN 1 ELSE 0 END) +
        (CASE WHEN FarmerName = '-' THEN 1 ELSE 0 END) +
        (CASE WHEN Area = '-' THEN 1 ELSE 0 END)) AS Hyphens
FROM try

DEMO

在表格中查找“ - ”的数量

1 个答案: