我有一个表,可能在两列(B 列和/或 C 列)之一中具有搜索值。我想根据 A 列生成一个摘要,显示所选搜索值的次数(例如 x ) 出现在每个人的任一列中。我想计算两列中的总数。
+--------+------+----+
| name | B | C |
+--------+------+----+
| john | x | z |
| john | x | x |
| john | y | x |
| peter | x | z |
| peter | x | z |
| amanda | x | x |
| amanda | x | x |
| amanda | x | x |
| amanda | x | y |
| amanda | x | y |
+--------+-----------+
在上面的示例中,假设我的搜索值为 x,我想计算每个人在 B 列和/或 C 列中出现 x 的次数。我还想生成总计,并生成以下输出:
Name B C
john 2 2
peter 2 0
amanda 5 3
total 9 5
我可以像这样分别为每一列做:
SELECT name, COUNT(*) as count FROM table
WHERE A = 'x'
GROUP BY name
ORDER BY count DESC";
SELECT name, COUNT(*) as count FROM table
WHERE B = 'x'
GROUP BY name
ORDER BY count DESC";
然后我可以循环对每个输出进行单独提取并将它们组合起来,但我想知道是否有一种方法可以在一个 mysql 语句中对两列进行检查和计数?
最佳答案
如果您想要分别计算每列的总和,则可以使用以下 ( SQL Fiddle):
(
SELECT MTA.Name, Sum(MTA.B = 'x') AS BSum, Sum(MTA.C = 'x') AS CSum
FROM MyTable MTA
GROUP BY MTA.Name
)
UNION
(
SELECT 'Total' AS name, Sum(MTB.B = 'x') AS BSum, Sum(MTB.C = 'x') AS CSum
FROM MyTable AS MTB
)
或者,如果您希望合并两列的总和,则可以执行类似以下操作 ( SQL Fiddle ):
(
SELECT MTA.Name, Sum(MTA.B = 'x') + Sum(MTA.C = 'x') AS PersonTotal
FROM MyTable MTA
GROUP BY MTA.Name
)
UNION
(
SELECT 'Total' AS name, Sum(MTB.B = 'x') + Sum(MTB.C = 'x') AS PersonTotal
FROM MyTable AS MTB
)
关于php - Mysql汇总所有包含两列之一中的值的行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19531677/