如何使我的代码更有效率（初学者 :)

Question

有人可以推荐一个更短的代码来做同样的事情吗？

CASE 
WHEN  {location} LIKE '%00' OR  {location} LIKE  '%010' OR  {location} LIKE '%011' OR  {location} LIKE '%012' OR  {location} LIKE '%013' THEN '1'
WHEN  {location} LIKE '%38' OR  {location} LIKE '%039' OR  {location} LIKE '%040' OR  {location} LIKE '%041' OR  {location} LIKE '%042' OR  {location} LIKE '%043' OR  {location} LIKE '%044' OR  {location} LIKE '%046' OR  {location} LIKE '%047' THEN '2'
ELSE '3' 
END

Answer 1

而不是几个 OR 你可以尝试使用范围

CASE when substr({location}, -2) ='00' 
  or cast(substr({location}, -2)) AS UNSIGNED )between 10 and 13 then '1'
    when cast(substr({location}, -2)) AS UNSIGNED) between 38 and 47 then '2'
  else '3'
end

Answer 2

如果您使用的是支持正则表达式的数据库，那么您可以大大简化这一过程。例如，在 MySQL:

(CASE WHEN  {location} REGEXP '00$|010$|011$|012$|013$' THEN '1'
      WHEN  {location} REGEXP '38$|039$|040$|041$|042$|043$|044$|046$|047$' THEN '2'
      ELSE '3' 
 END)

如何使我的代码更有效率（初学者 :)

How to make my code more efficient (beginner :)

sql

jsl