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SQL Server FAQ - PHP MSSQL - Query Multiple Tables Jointly

By: FYIcenter.com

(Continued from previous topic...)

PHP MSSQL - How To Query Multiple Tables Jointly?

If you want to query information stored in multiple tables, you can use the SELECT statement with a WHERE condition to make an inner join. Assuming that you have 3 tables in a forum system: "users" for user profile, "forums" for forums information, and "posts" for postings, you can query all postings from a single user with a script as shown below:

<?php
  $con = mssql_connect('FYI_SQL_SERVER','sa','FYIcenter');

  $userID = 101;
  $sql = "SELECT posts.subject, posts.time, users.name,"
    . " forums.title"
    . " FROM posts, users, forums"
    . " WHERE posts.userID = ".$userID
    . " AND posts.userID = users.id"
    . " AND posts.forumID = forums.id";
  $res = mssql_query($sql, $con);
  while ($row = mssql_fetch_array($res)) {
    print($row['subject'].", ".$row['time'].", "
      .$row['name'].", ".$row['title']."\n");
  }  
  mssql_free_result($res);

  mssql_close($con);
?>

(Continued on next topic...)

  1. PHP MSSQL - How To Create a New Table?
  2. PHP MSSQL - How To Drop an Existing Table?
  3. PHP MSSQL - How To Insert Data into an Existing Table?
  4. PHP MSSQL - How To Make a Column Nullable?
  5. PHP MSSQL - How To Insert Data with NULL Values?
  6. PHP MSSQL - How To Insert Multiple Rows with a subquery?
  7. PHP MSSQL - How To Get the Number of Affected Rows?
  8. PHP MSSQL - What Is a Result Set Object Returned by mssql_query()?
  9. PHP MSSQL - How To Loop through Returning Rows?
  10. PHP MSSQL - How To Update Existing Rows in a Table?
  11. PHP MSSQL - How To Delete Existing Rows in a Table?
  12. PHP MSSQL - How To Include Text Values in SQL Statements?
  13. PHP MSSQL - How To Include Date and Time Values in SQL Statements?
  14. PHP MSSQL - How To Display a Past Time in Days, Hours and Minutes?
  15. PHP MSSQL - How To Perform Key Word Search in Tables?
  16. PHP MSSQL - How To Query Multiple Tables Jointly?
  17. PHP MSSQL - How To Create an Identity Column?

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