SQL，如何根據子字符串檢索計數

Question

我需要在井位置分出一個lsd。 通常這是它看起來像什麼100/1-27-94-7w4m 我需要抓住任何是w4，w5，w6 這將是alberta 什麼是w3，w2，w1或任何東西另一個會是sask。

我該如何解析一個字符串才能得到這個數字... select count（*）from tblWell substring，charindex ...？例子將是很好

Answer 1

我會建議你做這樣的事情：

select which, count(*) 
from (select 'w4' as code, 'alberta' as which union all 
     select 'w5' as code, 'alberta' as which union all 
     select 'w6' as code, 'alberta' as which union all 
     select 'w1' as code, 'sask' as which union all 
     select 'w2' as code, 'sask' as which union all 
     select 'w3' as code, 'sask' as which 
    ) lookup join 
    table t 
    on t.column = '%'+lookup.which+'%' 
group by which;