Question

我有一个名为test的表，定义如下：

A bigint(20) NOT NULL
B bigint(20) NULL

我正在尝试执行以下准备好的声明：

sql = "SELECT * FROM  test GROUP BY B";
PreparedStatement preparedStatement = connection.prepareStatement(sql);
ResultSet rs = preparedStatement.executeQuery();

但我得到以下例外：

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 'anya_products.test.A' isn't in GROUP BY
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2293)
    at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)

完全相同的查询在SQLYog中有效。问题是什么？ JDBC限制？

由于 UDI

Answer 1

这就是我想出的。不确定它是最有效还是唯一的方式，但它似乎至少有效：

select test.a, test.b from test 
inner join (select b, count(b) from test group by b having count(b) = 1) as c
    on test.b = c.b

尝试在jdbc中获取未分组的列时出现异常

1 个答案: