Three methods for SQL to split a column into multiple columns

Time:2021-1-19

There is a column of data in the data table, as shown in the figure:

Now you need to divide this column into three columns.

The SQL code is as follows:

The first kind


select 
max(case when F1%3=1 then F1 else 0 end) a,
max(case when F1%3=2 then F1 else 0 end) b,
max(case when F1%3=0 then F1 else 0 end) c
from HLR151
group by (F1-1)/3

effect

The second kind


select 
c1=a.F1,c2=b.F1,c3=c.F1
from HLR151 a
left join HLR151 b on b.F1=a.F1+1 
left join HLR151 c on c.F1=a.F1+2
where (a.F1-1)%3=0

effect

The third kind


select 
max(case when (F1-1)/8=0 then F1 else 0 end) a,
max(case when (F1-1)/8=1 then F1 else 0 end) b,
max(case when (F1-1)/8=2 then F1 else 0 end) c
from HLR151
group by (F1-1)%8

effect

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