Question

我正在尝试构建一个T-SQL查询，以使用不同的名称列出某些列和具有特定条件的值。

这就是我在桌子上的内容：

Category   | Verdict      | Requests
-----------|--------------|----------
Category1  | Allowed      | 1000
Category2  | denied_now   | 100
Category2  | denied_later | 101
Category3  | Allowed      | 203

我想最终得到这样的结果。

Category   | Verdict      | Requests
-----------|--------------|----------
Category1  | Allowed      | 1000
Category2  | denied_all   | 201
Category3  | Allowed      | 203

我尝试了SELECT与GROUP BY和HAVING相结合，但我总是遇到错误。如何将这些值组合成Verdict = denied％的新名称下的新行？

Answer 1

我认为这应该可以解决问题：

import java.awt.*;
import java.awt.font.TextAttribute;
import java.math.*;
import java.text.*;
import java.util.Map;
import javax.swing.*;
import javax.swing.JFormattedTextField.*;
import javax.swing.event.*;
import javax.swing.text.InternationalFormatter;

public class DocumentListenerAdapter {

    public DocumentListenerAdapter() {
        JFrame frame = new JFrame("AbstractTextField Test");
        final JFormattedTextField textField1 = new JFormattedTextField(new Double(10.01));
        textField1.setFormatterFactory(new AbstractFormatterFactory() {
            @Override
            public AbstractFormatter getFormatter(JFormattedTextField tf) {
                NumberFormat format = DecimalFormat.getCurrencyInstance();
                format.setMinimumFractionDigits(2);
                format.setMaximumFractionDigits(2);
                format.setRoundingMode(RoundingMode.HALF_UP);
                InternationalFormatter formatter = new InternationalFormatter(format);
                formatter.setAllowsInvalid(false);
                //formatter.setMinimum(0.0);
                //formatter.setMaximum(1000.00);
                return formatter;
            }
        });
        final Map attributes = (new Font("Serif", Font.BOLD, 16)).getAttributes();
        attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
        final JFormattedTextField textField2 = new JFormattedTextField(new Double(10.01));
        textField2.setFormatterFactory(new AbstractFormatterFactory() {
            @Override
            public AbstractFormatter getFormatter(JFormattedTextField tf) {
                NumberFormat format = DecimalFormat.getInstance();
                format.setMinimumFractionDigits(3);
                format.setMaximumFractionDigits(3);
                format.setRoundingMode(RoundingMode.HALF_UP);
                InternationalFormatter formatter = new InternationalFormatter(format);
                formatter.setAllowsInvalid(false);
                //formatter.setMinimum(0.0);
                //formatter.setMaximum(1000.00);
                return formatter;
            }
        });
        textField2.getDocument().addDocumentListener(new DocumentListener() {
            @Override
            public void changedUpdate(DocumentEvent documentEvent) {
                printIt(documentEvent);
            }

            @Override
            public void insertUpdate(DocumentEvent documentEvent) {
                printIt(documentEvent);
            }

            @Override
            public void removeUpdate(DocumentEvent documentEvent) {
                printIt(documentEvent);
            }

            private void printIt(DocumentEvent documentEvent) {
                DocumentEvent.EventType type = documentEvent.getType();
                double t1a1 = (((Number) textField2.getValue()).doubleValue());
                if (t1a1 > 1000) {
                    Runnable doRun = new Runnable() {
                        @Override
                        public void run() {
                            textField2.setFont(new Font(attributes));
                            textField2.setForeground(Color.red);
                        }
                    };
                    SwingUtilities.invokeLater(doRun);
                } else {
                    Runnable doRun = new Runnable() {
                        @Override
                        public void run() {
                            textField2.setFont(new Font("Serif", Font.BOLD, 16));
                            textField2.setForeground(Color.black);
                        }
                    };
                    SwingUtilities.invokeLater(doRun);
                }
            }
        });
        //https://stackoverflow.com/a/20008786/714968
        JFormattedTextField jftf2 = new JFormattedTextField();
        final InternationalFormatter fmt = new InternationalFormatter(
                new MessageFormat("{0,number,000}-{1,number,0000}"));
        jftf2.setFormatterFactory(new JFormattedTextField.AbstractFormatterFactory() {
            @Override
            public JFormattedTextField.AbstractFormatter getFormatter(JFormattedTextField tf) {
                return fmt;
            }
        });
        jftf2.setValue(new Object[]{111, 1234});
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(textField1, BorderLayout.NORTH);
        frame.add(textField2, BorderLayout.CENTER);
        frame.add(jftf2, BorderLayout.SOUTH);
        frame.setVisible(true);
        frame.pack();
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                DocumentListenerAdapter main = new DocumentListenerAdapter();
            }
        });
    }
}

我发现SELECT Category, CASE WHEN Verdict LIKE 'denied%' THEN 'denied_all' ELSE Verdict END AS Verdict, SUM(Requests) Requests FROM TableName GROUP BY Category, CASE WHEN Verdict LIKE 'denied%' THEN 'denied_all' ELSE Verdict END ORDER BY Category中没有任何条件。

所以我在这里做的只是取代所有被拒绝的％＆＃39;与'否则_all＆＃39;判决所以它们可以分组，然后我按类别和修改判决进行分组，最后在Request字段中对所有值求和。没什么大秘密。

如果您不想重复HAVING，我认为您必须使用其中任何一种：

CASE WHEN

或者：

SELECT Category, Verdict, SUM(Requests) Requests
FROM (
    SELECT Category, CASE WHEN Verdict LIKE 'denied%' THEN 'denied_all' ELSE Verdict END AS Verdict, Requests
    FROM TableName
) SubQ
GROUP BY Category, Verdict
ORDER BY Category

SQL Server中的GROUP BY和WHERE子句

1 个答案: