Perrypackettracer / MySQL

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Specific Name or Adress #6

Open Perrypackettracer opened 9 months ago

Perrypackettracer commented 9 months ago

Let's explore how to select specific rows based on certain conditions in SQL. We'll focus on both selecting specific columns and filtering rows based on criteria.

  1. Selecting Specific Columns:

    • To retrieve specific columns from a table, use the SELECT statement. Specify the column names you want to retrieve after the SELECT keyword. For example:
      SELECT column1, column2, ...
      FROM table_name;

      Replace column1, column2, and table_name with actual column names and table name. If you want all columns, use SELECT *¹.

  2. Filtering Rows with the WHERE Clause:

    • To select rows that meet specific conditions, use the WHERE clause. It allows you to filter rows based on column values. For instance:
      SELECT Name, Address
      FROM Employees
      WHERE Name = 'John'; -- Retrieve employees named 'John'
    • You can combine multiple conditions using logical operators (e.g., AND, OR). For example:
      SELECT Name, Address
      FROM Customers
      WHERE Country = 'USA' AND City = 'New York';
  3. Wildcard for Partial Matches:

    • If you want to match names or addresses that start with a specific letter, use the LIKE operator with a wildcard %. For instance:
      SELECT Name, Address
      FROM Customers
      WHERE Name LIKE 'T%'; -- Retrieve names starting with 'T'

Remember to adapt the table name, column names, and conditions to your specific database schema. Happy querying! 🗂️🔍

Source: Conversation with Bing, 2/4/2024 (1) SQL SELECT Statement - W3Schools. https://www.w3schools.com/sql/sql_select.asp. (2) Select specific rows and columns from an SQL database. https://stackoverflow.com/questions/36682736/select-specific-rows-and-columns-from-an-sql-database. (3) SQL WHERE: Filter Rows Based on a Specified Condition. https://www.sqltutorial.org/sql-where/. (4) How To SELECT Rows FROM Tables in SQL | DigitalOcean. https://www.digitalocean.com/community/tutorials/how-to-select-rows-from-tables-in-sql.