sql中的那些错误

一、【1136】Column count doesn't match value count at row 1

二、【1248】MySQL--Every derived table must have its own alias

每个派生出来的表都必须有一个自己的别名
一般在多表查询时，会出现此错误。因为，进行嵌套查询的时候子查询出来的结果是作为一个派生表来进行上一级的查询的，所以子查询的结果必须要有一个别名。

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三、【1292】Truncated incorrect DOUBLE value: 'MChopin'

Caused by: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Truncated incorrect DOUBLE value: 'MChopin'
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3513)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)
 at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
 at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2554)
 at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1761)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2046)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1964)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1949)
 at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:477)
 at org.hibernate.engine.query.NativeSQLQueryPlan.performExecuteUpdate(NativeSQLQueryPlan.java:165)