Creating Database. specified as -P [port]: The port number to use for the connection. When a view is referenced, privilege checking occurs as described base tables or other views. The variable p1 retains its value after this, so if you use the view again without passing the parameter, it will use the prior one passed - which maybe confusing! Boolean algebra of the lattice of subspaces of a vector space? See the following customers from the sample database: The following statement creates a view based on the customers table with the name contactPersons with the MERGE algorithm: Suppose that you issue the following statement: When you issue a query to a TEMPTABLE view, MySQL performs these steps: Because MySQL has to create the temporary table to store the result set and moves the data from the base tables to the temporary table, the algorithm TEMPTABLE is less efficient than the MERGE algorithm. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Here is the syntax for creating a view in MySQL: You can also specify the SELECT statement for a view using the CREATE OR REPLACE VIEW syntax, which will either create a new view or replace an existing view with the same name. MySQL Views are used for several reasons: Overall, Views are a powerful tool for managing data in MySQL, as they can make it easier to work with, secure, and maintain large data sets. DEFINER. ; Create schema in SQL Server 2014 Understanding MySQL View Processing Algorithms A view also has rows and columns as they are in a real table in the database. For this, we will first create a cursor() object and will then pass the SQL command as a string to the . MySQL how create a view to work with query parameters DEFINER value of In the view use a cross join to the parameter table and put WHERE param_table.connection_id = CONNECTION_ID(). Asking for help, clarification, or responding to other answers. sudo mysql -u username\root -p 2. DELIMITER ;; CREATE PROCEDURE `SP_QUERY_VIEW_WITH_PARAMETERS` (IN p_having VARCHAR (300)) COMMENT 'Executes the statement' BEGIN SET @v_having = p_having; SET @v_sql=CONCAT ('SELECT id AS id_emp , user AS emp_name, . Canadian of Polish descent travel to Poland with Canadian passport. For other options or clauses in the definition, they are added to For more information, see extension to standard SQL. be treated as a parameter.
