字段里有4个字符，把只含一个'X'字符的记录选出来的SQL语句怎么写？
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- SQL code
declare @i table(col varchar(4))insert into @i(col)select 'AFGD'union select 'AXCF'union select 'XXCD'select * from @iselect * from @i where len(REPLACE(col,'X','')) = 3--AXCF