How to select username contains only 7 strings

from dba_users, how to select username contains only 7 channels?

Select decode (length (username)?) Please help. I just need to print the users whose name is exactly 7 charactars.

Try something like
SELECT username FROM dba_users WHERE LENGTH (username) = 7;

Tags: Database

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    I put the code for my main program and my class below just in case. I have already met the requirements of the teacher if the project is done, I'm just trying to improve.
    /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package myname.project.pkg6;

import java.util.Scanner;
import java.util.regex.Pattern;

/**
 *
 * @author wsteadma
 */
public class mynameProject6 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        // Used for testing
        String firstRoman;
        String secondRoman;
        
        
        Scanner keyboard = new Scanner(System.in);

        
        // Ask for user to input firstRoman Number
        System.out.print("Enter your first Roman Number:");
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        // add the Roman Number to the String variable
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        Roman firstNumber = new Roman(firstRoman);
        Roman secondNumber = new Roman(secondRoman);
        
        System.out.println("Printout of the created roman numbers");
        //Prints out the Roman Number
        firstNumber.printRoman();
        secondNumber.printRoman();
        
        
        // Convert Roman to Decimal
        firstNumber.setDecimal(firstRoman);
        secondNumber.setDecimal(secondRoman);
        
        System.out.println("Viewing the Decimal values for the two defined instances");
        //Prints decimal Numbers
        firstNumber.printDecimal();  
        secondNumber.printDecimal();
        
        System.out.println("Adding the Roman Numbers and returning new Roman value");
        Roman romanAdd;
        romanAdd = firstNumber.addRoman(secondNumber);
        romanAdd.printRoman();

        System.out.println("Subtracting the Roman Numbers and return new Roman value");
        Roman romanSub;
        romanSub = firstNumber.subRoman(secondNumber);
        romanSub.printRoman();
    }
}
    CLASS:
    /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package myname.project.pkg6;

/**
 *
 * @author wsteadma
 */
public class Roman {

    private String romNumber;
    private int decNumber;

    public Roman(String rNumber) {
        romNumber = rNumber;
    }

    public String getRoman() {
        return romNumber;
    }
    
    public int getDecimal()
    {
    return decNumber;
    }

    public void printRoman() {
        System.out.println("The Roman Number is " + romNumber);
    }

    public void printDecimal() {
        System.out.println("The Decimal Number is " + decNumber);
    }

    // Converts a roman number string into a decimal value
    public int setDecimal(String romNum) {
        int charValue = 0;
        char[] characters = new char[romNum.length()];

        //System.out.println("romNum length is " + romNum.length());
        for (int counter = 0; counter < romNum.length(); counter++) {
            characters[counter] = romNum.charAt(counter);
            //System.out.println(characters[counter]);
        }

        for (int sCounter = 0; sCounter < romNum.length(); sCounter++) {
            if (characters[sCounter] == 'M'  || characters[sCounter] == 'm') {
                charValue += 1000;
            } else if (characters[sCounter] == 'D' || characters[sCounter] == 'd') {
                charValue += 500;
            } else if (characters[sCounter] == 'C' || characters[sCounter] == 'c') {
                charValue += 100;
            } else if (characters[sCounter] == 'L' || characters[sCounter] == 'l') {
                charValue += 50;
            } else if (characters[sCounter] == 'X' || characters[sCounter] == 'x') {
                charValue += 10;
            } else if (characters[sCounter] == 'V' || characters[sCounter] == 'v') {
                charValue += 5;
            } else if (characters[sCounter] == 'I' || characters[sCounter] == 'i') {
                charValue += 1;
            }
        
        }
        decNumber = charValue;
        return charValue;
    }

    // Converts a decomal number to a roman number
    public String setDec2Roman(int decNum) {
        String newRoman = "";

        while (decNum >= 1000) {
            newRoman += "M";
            decNum -= 1000;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }

        while (decNum >= 500) {
            newRoman += "D";
            decNum -= 500;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }

        while (decNum >= 100) {
            newRoman += "C";
            decNum -= 100;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }

        while (decNum >= 50) {
            newRoman += "L";
            decNum -= 50;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }

        while (decNum >= 10) {
            newRoman += "X";
            decNum -= 10;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }

        while (decNum >= 5) {
            newRoman += "V";
            decNum -= 5;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }

        while (decNum > 0) {
            newRoman += "I";
            decNum -= 1;
            //System.out.println(decNum);
            //System.out.println(newRoman);
        }
        return newRoman;
    }

    public Roman addRoman(Roman newRom) {
        int totRom = newRom.setDecimal(newRom.romNumber) + decNumber;
        romNumber = newRom.setDec2Roman(totRom);
        return new Roman(romNumber);
    }
    
    public Roman subRoman(Roman subRom) {
        int totRom = decNumber - subRom.setDecimal(subRom.romNumber);
        romNumber = subRom.setDec2Roman(totRom);
        return new Roman(romNumber);
    }
    
}

    While (!.) Pattern.Matches ("MDCLXVI", firstRoman))

    Try "[MDCLXVI] *" and see if it's better

    {
    System.out.Print ("a valid Roman Number please try again");
    firstRoman = firstRoman.toUpperCase ();
    }

    My Code is as follows:

    // Ask for user to input firstRoman Number
System.out.print("Enter your first Roman Number:");
// add the Roman Number to the String variable
firstRoman = keyboard.nextLine();
firstRoman = firstRoman.toUpperCase();

    Once they enter in the it, I want to check to make sure that it has characters MDCLXVI and if it contains any other characters then I will provide a new object Scanner keyboard to try again and if it fails again, it will go to the option to try again until they put in a string that contains only the characters above. I don't know where to go here to get the while loop has worked. New to Java and I got my program work properly when I put good known numbers of novel, but I want to take incorrect entries.

    Any help would be appreciated.

    Thank you
    Wally

    I put the code for my main program and my class below just in case. I have already met the requirements of the teacher if the project is done, I'm just trying to improve.

    /*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package myname.project.pkg6;

import java.util.Scanner;
import java.util.regex.Pattern;

/**
*
* @author wsteadma
*/
public class mynameProject6 {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {

// Used for testing
String firstRoman;
String secondRoman;

Scanner keyboard = new Scanner(System.in);

// Ask for user to input firstRoman Number
System.out.print("Enter your first Roman Number:");
// add the Roman Number to the String variable
firstRoman = keyboard.nextLine();
firstRoman = firstRoman.toUpperCase();

// Ask for user to input secondRoman Number
System.out.print("Enter your second Roman Number:");
// add the Roman Number to the String variable
secondRoman = keyboard.nextLine(); // Add the name input into the name variable
secondRoman = secondRoman.toUpperCase();

//Creating first instance of Roman Numbers class
Roman firstNumber = new Roman(firstRoman);
Roman secondNumber = new Roman(secondRoman);

System.out.println("Printout of the created roman numbers");
//Prints out the Roman Number
firstNumber.printRoman();
secondNumber.printRoman();

// Convert Roman to Decimal
firstNumber.setDecimal(firstRoman);
secondNumber.setDecimal(secondRoman);

System.out.println("Viewing the Decimal values for the two defined instances");
//Prints decimal Numbers
firstNumber.printDecimal();
secondNumber.printDecimal();

System.out.println("Adding the Roman Numbers and returning new Roman value");
Roman romanAdd;
romanAdd = firstNumber.addRoman(secondNumber);
romanAdd.printRoman();

System.out.println("Subtracting the Roman Numbers and return new Roman value");
Roman romanSub;
romanSub = firstNumber.subRoman(secondNumber);
romanSub.printRoman();
}
}

    CLASS:

    /*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package myname.project.pkg6;

/**
*
* @author wsteadma
*/
public class Roman {

private String romNumber;
private int decNumber;

public Roman(String rNumber) {
romNumber = rNumber;
}

public String getRoman() {
return romNumber;
}

public int getDecimal()
{
return decNumber;
}

public void printRoman() {
System.out.println("The Roman Number is " + romNumber);
}

public void printDecimal() {
System.out.println("The Decimal Number is " + decNumber);
}

// Converts a roman number string into a decimal value
public int setDecimal(String romNum) {
int charValue = 0;
char[] characters = new char[romNum.length()];

//System.out.println("romNum length is " + romNum.length());
for (int counter = 0; counter < romNum.length(); counter++) {
characters[counter] = romNum.charAt(counter);
//System.out.println(characters[counter]);
}

for (int sCounter = 0; sCounter < romNum.length(); sCounter++) {
if (characters[sCounter] == 'M'  || characters[sCounter] == 'm') {
charValue += 1000;
} else if (characters[sCounter] == 'D' || characters[sCounter] == 'd') {
charValue += 500;
} else if (characters[sCounter] == 'C' || characters[sCounter] == 'c') {
charValue += 100;
} else if (characters[sCounter] == 'L' || characters[sCounter] == 'l') {
charValue += 50;
} else if (characters[sCounter] == 'X' || characters[sCounter] == 'x') {
charValue += 10;
} else if (characters[sCounter] == 'V' || characters[sCounter] == 'v') {
charValue += 5;
} else if (characters[sCounter] == 'I' || characters[sCounter] == 'i') {
charValue += 1;
}

}
decNumber = charValue;
return charValue;
}

// Converts a decomal number to a roman number
public String setDec2Roman(int decNum) {
String newRoman = "";

while (decNum >= 1000) {
newRoman += "M";
decNum -= 1000;
//System.out.println(decNum);
//System.out.println(newRoman);
}

while (decNum >= 500) {
newRoman += "D";
decNum -= 500;
//System.out.println(decNum);
//System.out.println(newRoman);
}

while (decNum >= 100) {
newRoman += "C";
decNum -= 100;
//System.out.println(decNum);
//System.out.println(newRoman);
}

while (decNum >= 50) {
newRoman += "L";
decNum -= 50;
//System.out.println(decNum);
//System.out.println(newRoman);
}

while (decNum >= 10) {
newRoman += "X";
decNum -= 10;
//System.out.println(decNum);
//System.out.println(newRoman);
}

while (decNum >= 5) {
newRoman += "V";
decNum -= 5;
//System.out.println(decNum);
//System.out.println(newRoman);
}

while (decNum > 0) {
newRoman += "I";
decNum -= 1;
//System.out.println(decNum);
//System.out.println(newRoman);
}
return newRoman;
}

public Roman addRoman(Roman newRom) {
int totRom = newRom.setDecimal(newRom.romNumber) + decNumber;
romNumber = newRom.setDec2Roman(totRom);
return new Roman(romNumber);
}

public Roman subRoman(Roman subRom) {
int totRom = decNumber - subRom.setDecimal(subRom.romNumber);
romNumber = subRom.setDec2Roman(totRom);
return new Roman(romNumber);
}

}

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