問(wèn)題描述

我有這個(gè) SQL 查詢:

I have this SQL Query:

select prefix, code, stat, complete, COUNT(*) as Count
from table
group by prefix, code, stat, complete
order by prefix, code, stat, complete

前綴"列是一個(gè)字母數(shù)字值 (0-9a-zA-z).我想要的是讓它如果前綴的值是一個(gè)數(shù)字，使數(shù)字等于0.如果它是一個(gè)字母，它會(huì)保持它的值.我試圖在 group by 子句下面添加以下行:

The column 'prefix' is an alphanumeric value (0-9a-zA-z). What I want is to make it so that if the value of prefix is a number, to make the number equal to 0. If it is a letter, it will keep its value. I have tried to add the following line beneath the group by clause:

(case when prefix like '%[0-9]%' then 0 else prefix end)

但我收到錯(cuò)誤消息將 varchar 值 'J' 轉(zhuǎn)換為數(shù)據(jù)類型 int 時(shí)轉(zhuǎn)換失敗.".

But I get an error "Conversion failed when converting the varchar value 'J' to data type int.".

是什么導(dǎo)致了這個(gè)錯(cuò)誤?如何讓前綴"列顯示 0 或一個(gè)字母?

What is causing this error? How can I get the 'prefix' column to display either 0 or a letter?

推薦答案

case when prefix like '%[0-9]%' then '0' else prefix end

你顯然也需要這個(gè)作為 GROUP BY 中的表達(dá)式:

You obviously also need this as the expression in the GROUP BY:

select 
    NewPrefix = case when prefix like '%[0-9]%' then '0' else prefix end, 
    code, 
    stat, 
    complete, 
    COUNT(*) as Count
from table
group by 
    case when prefix like '%[0-9]%' then '0' else prefix end, 
    code, stat, complete
order by 
    case when prefix like '%[0-9]%' then '0' else prefix end, 
    code, stat, complete

這篇關(guān)于GROUP BY 同一列中的多個(gè)值的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！