原表如下: with t1 as( select 1 as id, "a,b" as course union select 2 as id, "a,b,c" as course union select 3 as id, null as course union select 4 as id, "c" as course
)
select * from t1; idcourse1a,b2a,b,c3NULL4c
需要将 cou...
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