[英]How to make my code more efficient (beginner :)
有人可以建議一個更短的代碼嗎?
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
相反,您可以嘗試在范圍之間使用多個或
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
如果您使用的是支持正則表達式的數據庫,那么您可以大大簡化它。 例如,在 MySQL 中:
(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)
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