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SELECT max(val) as level_max_val from (select greatest(level1,level2,level3,level4,level5,level6,level7,level8,level9,level10) as val from kbt_2020cv52_data) k;sql 语句
SELECT max(val) as level_max_val from (select greatest(level1,level2,level3,level4,level5,level6,level7,level8,level9,level10) as val from kbt_2020cv52_data) k;