These terms are used with the WHERE clause, and the search is case-insensitive.Įxamples of queries with LIKE /NOT LIKE - This WHERE clause matches MarPlo, marius, Mars, and so on, but not Omar. _ (an underscore), matches exactly one character.% - matches any sequence of characters or none.You can perform mathematical calculations within your queries using the mathematic addition (+), subtraction (-), multiplication (*), division (/), and modulo (%) characters.Įxample: $sql = "SELECT `name`, `pass` FROM `users` WHERE `id`=($x + $y)" LIKE, NOT LIKE LIKE and NOT LIKE terms are used for string matching in combination with the following two wildcard characters:.Id: 2 - email: The WHERE clause can also be used with ORDER BY and LIMIT options to order and limit the data in the recordset.Įxample: $sql = "SELECT `name`, `pass` FROM `users` WHERE `id`>2 ORDER BY `name` LIMIT 2" Notice, in the $sql query is used a variable ($name) which contains the name, this variable is aded within single quotes in the query becouse MySQL need to get its value as a string. The reason for this is that the columns listed after SELECT dictate only what columns to return and the columns listed in a WHERE dictate which rows to return. Example (selects all rows from "users" table where " name=MarPlo" and output the "id" and "email"): query($sql) // if the $result contains at least one rowif ($result->num_rows > 0) $conn->close() ?> - As you can see, you don't have to select a column on which you are performing a WHERE condition. Not within a specific range (min and max) The table below lists the most common operators in MySQL WHERE expressions: These conditionals can use comparison, arithmetic and logical operators. Syntax: SELECL column_name(s) FROM table_name WHERE condition(s) " condition(s)" - is one ore more conditionals that specifies the select criteria. The WHERE clause is used to filter records, and is added after the name of the table. Using WHERE and Conditionals to search for specific valuesTo search for specific values, to extract only those records that fulfill a specified criterion, add a WHERE clause to the SELECT query.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |