oracle之sql試題

    方法一：使用函數的方式 select   count(*) Total, sum(decode(to_char(hiredate,'yyyy'),'1980',1,0))   ''1980'', sum(decode(to_char(hiredate,'yyyy'),'1982',1,0))   ''1982'',  sum(decode(to_char(hiredate,'yyyy'),

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