SQL Operators
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Questions and Answers

What is the primary function of the SQL NOT operator in a query?

  • To sort the results in descending order
  • To filter only those rows that do not meet the conditions mentioned in the WHERE clause (correct)
  • To filter rows that meet the conditions mentioned in the WHERE clause
  • To combine two or more conditions in the WHERE clause
  • What is the purpose of the SQL BETWEEN operator?

  • To test if an expression is within a range of values (correct)
  • To sort the results in ascending order
  • To combine multiple conditions in a WHERE clause
  • To filter out rows that meet the conditions mentioned in the WHERE clause
  • What is the correct syntax for using the NOT operator in a query?

  • SELECT column_name(s) FROM table_name WHERE condition;
  • SELECT column_name(s) FROM table_name WHERE NOT condition; (correct)
  • SELECT column_name(s) FROM table_name WHERE NOT;
  • SELECT column_name(s) FROM table_name WHERE condition NOT;
  • What is the result of combining NOT and AND operators in a query?

    <p>The query returns only those rows that meet both the conditions mentioned in the WHERE clause</p> Signup and view all the answers

    What is the difference between the SQL AND and OR operators?

    <p>The AND operator is used to combine multiple conditions, while the OR operator is used to filter out rows that do not meet the conditions</p> Signup and view all the answers

    What is the purpose of the SQL logical operators in a query?

    <p>To combine multiple conditions in a WHERE clause for filtering rows</p> Signup and view all the answers

    What is the purpose of the WHERE clause in SQL?

    <p>To filter records based on a specified condition.</p> Signup and view all the answers

    Which of the following is NOT a component of a WHERE clause?

    <p>Aggregate functions.</p> Signup and view all the answers

    What happens when the condition in the WHERE clause returns false?

    <p>No records are returned.</p> Signup and view all the answers

    Which SQL clause is used to sort records in ascending or descending order?

    <p>ORDER BY clause.</p> Signup and view all the answers

    What is the purpose of the HAVING clause in SQL?

    <p>To specify conditions for groups of records.</p> Signup and view all the answers

    How many kinds of SQL Clauses are there in MySQL Server?

    <p>5</p> Signup and view all the answers

    What is the purpose of the UNIQUE operator in SQL?

    <p>To search every row of a specified table for uniqueness (no duplicates)</p> Signup and view all the answers

    What is the function of the NOT operator in SQL?

    <p>To reverse the meaning of the logical operator with which it is used</p> Signup and view all the answers

    What is the purpose of the IS NULL operator in SQL?

    <p>To compare a value with a NULL value</p> Signup and view all the answers

    Which SQL clause is used to request specific information from a database table?

    <p>MySQL queries</p> Signup and view all the answers

    What is the purpose of the OR operator in SQL?

    <p>To combine multiple conditions in an SQL statement's WHERE clause</p> Signup and view all the answers

    What is the purpose of arithmetic operators in SQL?

    <p>To perform calculations and manipulate data in SQL statements</p> Signup and view all the answers

    What is the purpose of the SQL IN operator?

    <p>To select data that matches a list of values.</p> Signup and view all the answers

    What is the result of the query SELECT * FROM Employee Where sal IN(50000,60000,70000)?

    <p>All employees with salaries equal to 50000, 60000, or 70000.</p> Signup and view all the answers

    What is the difference between the SQL IN operator and the BETWEEN operator?

    <p>The IN operator is used for a list of values, while the BETWEEN operator is used for a range of values.</p> Signup and view all the answers

    What is the purpose of the SQL BETWEEN operator?

    <p>To select data from a specific date range.</p> Signup and view all the answers

    What happens when a field in a table is optional and no value is inserted?

    <p>The field will be saved with a NULL value.</p> Signup and view all the answers

    What is a NULL value in a database?

    <p>A field with no value.</p> Signup and view all the answers

    What is the purpose of the SQL WHERE clause?

    <p>To specify a condition while fetching data from a single table or joining with multiple tables.</p> Signup and view all the answers

    What is the purpose of the SQL AND logical operator?

    <p>To combine two or more conditions mentioned in a WHERE clause of a query.</p> Signup and view all the answers

    What is the SQL syntax to fetch all records from a table where the 'birthdate' is less than '2000-01-01'?

    <p>SELECT * FROM table_name WHERE birthdate &lt; '2000-01-01'</p> Signup and view all the answers

    What is the correct SQL query to fetch all records from the 'Employee' table where the 'Salary' is not equal to $60,000?

    <p>SELECT * FROM Employee WHERE Salary != 60,000;</p> Signup and view all the answers

    What is the purpose of the SQL WHERE clause in an UPDATE statement?

    <p>To specify a condition for which records to update.</p> Signup and view all the answers

    What is the correct SQL syntax to fetch all records from a table where the 'id' is greater than 2?

    <p>SELECT * FROM table_name WHERE id &gt; 2;</p> Signup and view all the answers

    Study Notes

    SQL WHERE Clause

    • The SQL WHERE clause is used to specify a condition while fetching data from a single table or joining with multiple tables.
    • The syntax is: SELECT columns FROM table_name WHERE [condition].
    • Examples:
      • SELECT * FROM info WHERE address = 'Akre';
      • SELECT * FROM info WHERE id &gt; 2;
      • SELECT * FROM info WHERE id &lt;= 2;
      • SELECT * FROM info WHERE birthdate &lt; '2000-01-01';

    SQL Operators

    SQL Comparison Operators

    • Examples:
      • SELECT * FROM Employee WHERE Salary = 60000;
      • SELECT * FROM Employee WHERE Salary != 60000;

    SQL Logical Operators

    • AND Logical Operator:
      • Used to combine two or more conditions in a WHERE clause.
      • Example: SELECT Customer_name FROM Orders WHERE Items_purchased = 'pencil' OR Items_purchased = 'eraser' AND City = 'London';
    • NOT Logical Operator:
      • Used to filter only those rows that do not meet the conditions mentioned in the WHERE clause.
      • Example: SELECT * FROM Orders WHERE NOT Items_purchased = 'pencil';
    • NOT – AND – OR Logical Operator:
      • Example: SELECT * FROM Orders WHERE NOT MONTH(Order_date) = '2' AND Items_purchased = 'Books';

    SQL Between Operators

    • The SQL BETWEEN condition allows testing if an expression is within a range of values (inclusive).
    • The values can be text, date, or numbers.
    • Example: SELECT * FROM Orders WHERE OrderDate BETWEEN '2023-01-01' AND '2023-01-07';

    SQL IN Operators

    • The SQL IN operator is used to select data that matches any value in a list.
    • Example: SELECT * FROM Employee WHERE sal IN (50000, 60000, 70000);
    • Example: SELECT * FROM info WHERE address IN ('Hawler', 'Duhok');

    SQL NULL Values

    • A NULL value is a field with no value.
    • If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.
    • Then, the field will be saved with a NULL value.

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    Description

    Test your knowledge of SQL operators such as LIKE, NOT, OR, IS NULL, and UNIQUE. Learn how to use them in SQL statements and practice with this quiz.

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