用case/if語句更新多列？

Question

預先感謝您：

我有一個表1：

id  || batches || IC_chips 

DRG001 || JHL001 || layer1 
DRG001 || JHL001 || layer2 
DRG001 || JHL001 || layer3 
DRG001 || JHL001 || layer4 
DRG001 || JHL001 || layer5 
DRG001 || JHL001 || layer6 
DRG001 || JHL002 || layer7 
DRG001 || JHL002 || layer8 
DRG001 || JHL002 || layer9 
DRG001 || JHL002 || layer10 
POQ001 || ADG001 || layer1 
POQ001 || ADG001 || layer2 
POQ001 || ADG001 || layer3 
POQ001 || ADG001 || layer4 
POQ001 || ADG001 || layer5 
POQ001 || ADG001 || layer6 

輸出表：

ID  || print_batch_1 || Print_batch_2 || Count_print_batch_1 || Count_print_batch_2 || Batch_count 
DRG001 || JHL001   || JHL002   || 06     || 04     || 02 
POQ001 || ADG001   || Null   || 06     || Null     || 01 

我用update語句嘗試過，但我面臨的一個問題，當他們不止一個打印批次。

這是我試圖用代碼：

update tab 
set Count_name=b.Count_name 
,batch_count=b.batch_count 
from 
table1 tab 
inner join 
(
select Name, count(batches) as Count_name, count(distinct batches) as 
batch_count 
from table1 
group by batches) b 
on tab.batches=b.batches 

Answer 1

請試試這個 -

update tab B 
set Count_name = a.batches, batch_count = batch_cnt 
from (
      select batches, count(*) batch_cnt 
      from table1 A 
      where a.batches = b.batches 
     ) 
where 
    exists (
       select 1 
       from table1 A 
       where a.batches = b.batches 
      )