Introduction Tutorial PHP

 









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Logical_Operators

  <?php     $age = 20 ;     $age1 = 25 ;     if ( $age >= 18 && $age <= 21 )     {         echo "You are Eligible<br>" ;     }         if ( $age >= 18 || $age <= 21 )     {         echo "You are Eligible<br>" ;     }     //Below condition is True So that "Not Operator(!)" will return False condition     if (!( $age >= 18 ))     {         echo "You are Eligible<br>" ;     }     //Below condition is False So that "Not Operator(!)" will return True condition     if (!( $age <= 18 ))     {         echo "You are Eligible<br>" ;     }     //If both condition is "True" OR "False" at that time xor will return "False" and if one condition is     //"True" and s...
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SubQuery with EXISTS and NOT EXISTS in PHP

 SELECT with SubQuery Syntax : SELECT columns FROM table1 WHERE column = (SELECT columns FROM table2 WHERE condition); In "personal" table, there are 6 columns named id, name, percentage, age, gender, city. In "personal" table, column name "id" is PRIMARY KEY and column name "city" is FOREIGN KEY. In "courses" table, there are 2 columns named course_id and course_name. In "courses" table, column name "course_id" is PRIMARY KEY. In "city" table, there are 2 columns named cid and cityname. In "city" table, column name "cid" is PRIMARY KEY. If we want to select records from "personal" table who belong to Delhi from "city" table using SubQuery then we can use below shown sql query : SELECT name FROM personal WHERE city = (SELECT cid FROM city WHERE cityname = "Delhi"); If we want to select records from "personal" table who belong to Delhi and Agra from...
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Get Functions

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