因此,我想从两个不同的表中计算每个卖家的销售总数。 而且我写下了代码,但是它不起作用.....谁能帮我吗??? 因此,它应产生该SellerID = 1且count =13。SellerID = 2并且count = 14。所以我想为每个卖方产生3个销售总额,但是输出显示红线....
String[] sellerID = {"1","2","3"};
int num = 0;
String []totalAmountSale = new String[3];
String sql = "SELECT tblOrder.SellerID, COUNT(*) " +
"FROM tblOrder, tblSeller " +
"WHERE tblOrder.SellerID = tblSeller.SellerID " +
"GROUP BY tblOrder.SellerID"
+ "ORDER BY tblOrder.SellerID;";
ResultSet rs = db.query(sql);
try {
while(rs.next())
{
totalAmountSale[num]= ""+rs.getInt(2);
num++;
}
rs.close();
} catch (SQLException ex) {
Logger.getLogger(DatabaseWork.class.getName()).log(Level.SEVERE, null, ex);
}
String out = "";
for (int i = 0; i < 3; i++) {
out+= totalAmountSale[i]+"\n";
}
JOptionPane.showMessageDialog(null,out );
}
答案 0 :(得分:0)
您错过了一个空格:
String sql = "SELECT tblOrder.SellerID, COUNT(*) " +
"FROM tblOrder, tblSeller " +
"WHERE tblOrder.SellerID = tblSeller.SellerID " +
"GROUP BY tblOrder.SellerID "
+ "ORDER BY tblOrder.SellerID;";