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PHP $result = mysql_query("SELECT * FROM yourTable WHERE city = 'c7'"); $matchFound = mysql_num_rows($result) > 0 ? 'yes' : 'no'; echo $matchFound; You can also use if condition there.
The Correct Command. If you want to check whether a record already exists in your database or not, you should run the following code: Using MySqli. <?php // connect to database $mysqli = new mysqli ("localhost", "db_user", "db_password", "db_name"); $query = "SELECT * FROM products WHERE code = '$code'"; $result = $mysqli -> query ($query);
The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns TRUE if the subquery returns one or more records. EXISTS Syntax. SELECT column_name (s) FROM table_name. WHERE EXISTS. (SELECT column_name FROM table_name WHERE condition); Demo Database.
15 maj 2009 · Quite often I need to look into the database to see if a record exists. For example, to check if a username already exists when creating a new user. I created a simple function to do this for me with mysqli.
To see whether some value exists in a database, we should never select the data itself, but only the count of rows that contains the requested value. $sql = "SELECT count(1) FROM users WHERE name = ?"
To check if a record exists in PHP and MySQL, you can use the SELECT statement. For example, the following code will check if a record with the id of 1 exists in the users table: echo "Record exists"; echo "Record does not exist";
22 cze 2011 · If you need to guarantee that the table doesn't exist, use mysql_errno() to get the error code and compare it to the relevant MySQL errors.
