[英]Sum different values of same type in same column in one SQL query
目前我正在执行以下操作以计算列中不同语言的付款方式:
$sql = "SELECT `payment`, count(*) as number FROM Test GROUP BY `payment` ";
结果:
Cash 2
Bar 4
Credit-Card 5
Kreditkarte 8
Invoice 12
Rechnung 27
任何想法如何在一个 SQL 查询中对不同语言的相同支付方式求和以获得以下内容,而括号中的部分显然没有:
Bar 6 (sum of Cash and Bar)
Kreditkarte 13 (sum of Credit-Card and Kreditkarte)
Rechnung 39 (sum of Invoice and Rechnung)
表名:测试
payment
===========
Cash
Bar
Credit-Card
Kreditkarte
Invoice
Rechnung
使用CASE
表达式将'Cash'
更改为'Bar'
, 'Credit-Card'
更改为'Kreditkarte'
和'Invoice'
更改为'Rechnung'
并按其结果分组:
SELECT CASE payment
WHEN 'Cash' THEN 'Bar'
WHEN 'Credit-Card' THEN 'Kreditkarte'
WHEN 'Invoice' THEN 'Rechnung'
ELSE payment
END AS payment,
COUNT(*) AS number
FROM Test
GROUP BY 1;
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