摘要:使用hibernate出现以下错误 java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long at com.mysql.jdbc.SQLErro
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摘要:一、sql要掌握 1、sum select sum(score) from table 2、group select name, sum(score) from table group by 3、avg() SELECT AVG(OrderPrice) AS OrderAverage FROM Or
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