子集 -

Question

我想选择一个表的一个子集的字段的记录数量和金额

然后我要计数的记录数在这个子集

最后得到一个特定领域

我的代码的总和如下： -

// get the subset of records in the XXXXXX table 
ps = conn.prepareStatement("SELECT Field1, Field2, Field3 FROM XXXXXXX " 
    + "WHERE Field1 = ? AND Field2 = ? AND Field3 = ? " 
    + "GROUP BY Field1, Field2, Field3"); 
ps.setString(1, variable1); 
ps.setString(2, variable2); 
ps.setString(3, variable3); 
rs = ps.executeQuery(); 

int recordCount1 = 0; 
while (rs.next()) { 
recordCount1 = recordCount1 + rs.getInt(1); 
} 

rs.close(); 
ps.close(); 

myConsole.getOut().println("Number of records in Subset1 of table 
    XXXXXXX: " + recordCount1); 

// now split the subset into those records where P/L > 0 
and those records where P/L <0 
// positive P/L 
ps = conn.prepareStatement("SELECT Field1, Field2, Field3 " 
    + "SUM(PL) AS Total_Profit FROM XXXXXX " 
    + "WHERE Field1 = ? AND Field2 = ? AND Field3 = ? " 
    + "AND PL >= 0 " 
    + "GROUP BY Field1, Field2, Field3"); 
ps.setString(1, variable1); 
ps.setString(2, variable2); 
ps.setString(3, variable3); 
rs = ps.executeQuery(); 

int recordCount2a = 0; 
while (rs.next()) { 
recordCount2a = recordCount2a + rs.getInt(1); 
} 

myConsole.getOut().println("Number of records in Subset of table 
XXXXXX where P/L >= 0: " + recordCount2a); 

---

我得到子集中的记录数为零计数

代码中有哪些区域是不正确的？

Answer 1

第一个查询。 - >显示计数FIELD1

SELECT FIELD1, COUNT(FIELD1) FROM XXXXX 
WHERE FIELD1= ? AND FIELD2=? AND FIELD3=? 
GROUP BY FIELD1 

第二个查询 - > FIELD1和PL SUM

SELECT FIELD1, COUNT(FIELD1), SUM(PL) AS Total_Profit FROM XXXXX 
WHERE FIELD1= ? AND FIELD2=? AND FIELD3=? AND PL > 0 
GROUP BY FIELD1