Found 4219 Articles for MySQLi

With the use of ego, \G option at end of a statement, we can get the result set in vertical format. Consider the following example −mysql> Select * from Student where name = 'Aarav'\G *************************** 1. row ***************************   Name: Aarav RollNo: 150  Grade: M.SC 1 row in set (0.00 sec)

MySQL determines the end of a statement when it encounters any one of the followings −Semicolon(;)Generally, MySQL determines the end of the statement, single-line or multiple-line, when it encounters the termination semicolon(;). Consider the examples below, mysql> Select * from employee; (Single line statement) mysql> Select *     -> from     -> employee; (Multiple line statement)In both cases, MySQL returns the result set after encountering the semicolon, which means the end of the statement.\G option\G option means to send the current state to the server to be executed and display the result in a vertical format. When we ... Read More

With the help of \G or \g option just at the end of the MySQL statement, we can run it without the semicolon. Consider the example below −mysql> Select * from Stock_item\G *************************** 1. row *************************** item_name: Calculator     Value: 15  Quantity: 89 *************************** 2. row *************************** item_name: Notebooks     Value: 63  Quantity: 40 *************************** 3. row *************************** item_name: Pencil     Value: 15  Quantity: 40 *************************** 4. row *************************** item_name: Pens   Value : 65 Quantity: 32 *************************** 5. row *************************** item_name: Shirts     Value: 13  Quantity: 29 *************************** 6. row *************************** item_name: Shoes     ... Read More

As we know that after writing the first line of multiple-line queries, MySQL changes the prompt. The following table shows different MySQL prompts and it's meaning −PromptMeaning         mysql>It means MySQL is ready for a new command. →It means that MySQL is waiting for the next line of multiple-line command. ‘>It means that MySQL is waiting for the next line, waiting for the completion of a string that began with a single quote. “>It means that MySQL is waiting for the next line, waiting for the completion of a string that began with a double quote. `>It means that MySQL is waiting ... Read More

After writing the first line of multiple-line queries, MySQL changes promptly from ‘mysql>’ to ‘→’. It is significant because with the help of it we got an indication that MySQL has not seen a complete statement yet and is waiting for the rest. Consider the example below,mysql> Select *     -> from     -> stock_item;We know that after writing the first line i.e. ‘Select *’ Mysql changes its prompts which means that yet the state has not been completed. After the semicolon, MySQL considers the statement completed and throws the output.

Single Row Sub QueryA single-row subquery is used when the outer query's results are based on a single, unknown value. Although this query type is formally called "single-row, " the name implies that the query returns multiple columns-but only one row of results. However, a single-row subquery can return only one row of results consisting of only one column to the outer query.In the below SELECT query, inner MySQL returns only one row i.e. the minimum salary for the company. It, in turn, uses this value to compare the salary of all the employees and displays only those, whose salary ... Read More

If a subquery is nested inside another subquery then it is called a nested subquery. To make it understand we are creating the nested subquery from the following tables data −mysql> Select * from Cars; +------+--------------+---------+ | ID   | Name         | Price   | +------+--------------+---------+ |    1 | Nexa         | 750000  | |    2 | Maruti Swift | 450000  | |    3 | BMW          | 4450000 | |    4 | VOLVO        | 2250000 | |    5 | Alto   ... Read More

If a subquery, used with EXIST operator, returns no rows, the expression EXIST returns FALSE and MySQL returns the empty set as output. It can be understood with the help of simple example using the following data from table ‘Customers’ −mysql> Select * from Customers; +-------------+----------+ | Customer_Id | Name     | +-------------+----------+ |           1 | Rahul    | |           2 | Yashpal  | |           3 | Gaurav   | |           4 | Virender | +-------------+----------+ 4 rows in ... Read More

If a subquery, used with EXIST operator, returns NULL, the expression EXIST NULL returns TRUE and MySQL returns the result based on an outer query. It can be understood with the help of simple example using the following data from table ‘Customers’ −mysql> Select * from Customers; +-------------+----------+ | Customer_Id | Name     | +-------------+----------+ | 1           | Rahul    | | 2           | Yashpal  | | 3           | Gaurav   | | 4           | Virender | +-------------+----------+ 4 rows in ... Read More

We can use MySQL EXIST operator to test for the existence of a record in the subquery. In other words, we can say that EXIST operator checks if a subquery returns any rows. The syntax of using EXIST operator with MySQL subquery is as follows −SyntaxWHERE EXISTS (Subquery)The above EXIST (subquery) expression returns TRUE if the subquery returns at least one row, otherwise it returns false.ExampleTo make it understand we are using the data from the following tables −mysql> Select * from Customers; +-------------+----------+ | Customer_Id | Name     | +-------------+----------+ | 1           | ... Read More