如何简化大CASE声明？

Question

我想让这个正常工作的代码更加美丽.

SET @weightClass = CASE 
    WHEN @totalWeight < 50 THEN 'A'
    WHEN @totalWeight < 100 THEN 'B'
    WHEN @totalWeight < 150 THEN 'C'
    WHEN @totalWeight < 200 THEN 'D'
    WHEN @totalWeight < 250 THEN 'E'
    WHEN @totalWeight < 300 THEN 'F'
    WHEN @totalWeight < 350 THEN 'G'
    WHEN @totalWeight < 400 THEN 'H'
    WHEN @totalWeight < 450 THEN 'I'
    WHEN @totalWeight < 500 THEN 'J'
    WHEN @totalWeight < 550 THEN 'K'
    WHEN @totalWeight < 600 THEN 'L'
    WHEN @totalWeight < 650 THEN 'M'
    WHEN @totalWeight < 700 THEN 'N'
    WHEN @totalWeight < 750 THEN 'O'
    WHEN @totalWeight < 800 THEN 'P'
    WHEN @totalWeight < 850 THEN 'Q'
    WHEN @totalWeight < 900 THEN 'R'
    WHEN @totalWeight < 950 THEN 'S'
    ELSE 'T'
END

我想可能有一种方法可以使用字母的ASCII值和50的逻辑增量.这样做是否可行(并且可行)？如何以及它会明显减慢查询速度？

Answer 1

获取字符的函数是CHAR()
A的ascii代码是65

SELECT CASE 
    WHEN @totalWeight >= 950 THEN 'T'
    ELSE CHAR(@totalWeight / 50 + 65)
END