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select id,name,substring(id,5,1) as [value] from tb
select id,name,substring(id,4,2) as [value] from tb
1.select id,name,substring(id,5,1) as value from tb
2.select id,name,substring(id,4,2) as value from tb
select id,name,substring(id,5,1) as value from tb
select id,name,substring(id,4,1) as value from tb