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Database Articles
Page 273 of 547
How can I create a stored procedure to update values in a MySQL table?
We can create a stored procedure with IN operator to update values in a MySQL table. To make it understand we are taking an example of a table named ‘student_info’ having the following data −mysql> Select * from student_info; +------+---------+------------+------------+ | id | Name | Address | Subject | +------+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Jaipur | Literature | | 110 | Rahul | Chandigarh | History | | 125 | Raman | Bangalore | Computers | +------+---------+------------+------------+ 4 rows ...
Read MoreHow can we assign a bit value as a number to a user variable?
As we know that the default type of a bit values assigned to user variables is binary strings but we can also assign a bit value to a number by using the following two methods −By using CAST() functionWith the help of CAST(… AS UNSIGNED) the bit value can be assigned a number. The following example will illustrate it −mysql> SET @abc = CAST(0b1000011 AS UNSIGNED); Query OK, 0 rows affected (0.00 sec) mysql> Select @abc; +------+ | @abc | +------+ | 67 | +------+ 1 row in set (0.00 sec)By adding 0(+0)The bit value can be ...
Read MoreHow can I create a stored procedure to insert values in a MySQL table?
We can create a stored procedure with an IN operator to insert values in a MySQL table. To make it understand we are taking an example of a table named ‘student_info’ having the following data −mysql> Select * from student_info; +------+---------+-----------+------------+ | id | Name | Address | Subject | +------+---------+-----------+------------+ | 100 | Aarav | Delhi | Computers | | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Jaipur | Literature | | 110 | Rahul | Chandigarh | History | +------+---------+------------+------------+ 4 rows ...
Read MoreHow can local variables be used in MySQL stored procedure?
Local variables are those variables that are declared within the stored procedure. They are only valid within the BEGIN…END block where they are declared and can have any SQL data type. To demonstrate it, we are creating the following procedure −mysql> DELIMITER // ; mysql> Create Procedure Proc_Localvariables() -> BEGIN -> DECLARE X INT DEFAULT 100; -> DECLARE Y INT; -> DECLARE Z INT; -> DECLARE A INT; -> SET Y = 250; -> SET Z = 200; ...
Read MoreHow can we see the source code of a particular MySQL stored procedure?
With the help of SHOW CREATE PROCEDURE statement, we can see the source code of a stored procedure. To make it understand we are using the stored procedure named allrecords() in the query as follows −mysql> Show Create Procedure allrecords\G *************************** 1. row *************************** Procedure: allrecords sql_mode:ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_ZERO, NO_AUTO_CREATE_USER, NO_ENGINE_SUBSTITUTION Create Procedure: CREATE DEFINERb=`root`@`localhost` PROCEDURE `allrecords`() BEGIN Select * from Student_info; END character_set_client: cp850 collation_connection: cp850_general_ci Database Collation: latin1_swedish_ci 1 row in set (0.00 sec)
Read MoreHow MySQL evaluates when I use a conditional expression within SUM() function?
As we know that, by using a conditional expression within SUM() function we can get the number of rows that meet the condition. So, in this case, MySQL evaluates to 1 each time the condition is true and 0 each time it is false.To understand it, consider the following example of table ‘employee’, having the following details −mysql> Select * from Employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 ...
Read MoreWhat are the different modes of parameters used by MySQL stored procedure?
Parameters make the stored procedure more useful and flexible. In MySQL, we have the following three kinds of modes −IN modeIt is the default mode. When we define an IN parameter in a stored procedure, the calling program has to pass an argument to the stored procedure. The value of an IN parameter is protected which means that even the value of the IN parameter is changed inside the stored procedure; its original value is retained after the stored procedure ends.OUT modeThe value of an OUT parameter can be changed inside the stored procedure and its new value is passed back to the calling ...
Read MoreHow can we find the most recent and most oldest date from a table with the help of MySQL MAX() and MIN() functions?
For getting the most recent date from a table, we need to provide the name of the column, having a date as value, as the argument of MAX() function. Similarly, forgetting the oldest date from a table, we need to provide the name of a column, having a date as value, as the argument of MIN() function. To understand it, consider the following example of table ‘Collegedetail’, having the following details −mysql> Select * from collegedetail; +------+---------+------------+ | ID | Country | estb | +------+---------+------------+ | 111 | INDIA ...
Read MoreWhat is the method with the help of which the hexadecimal value can be treated as a number?
For treating the hexadecimal value as a number, we can use the CAST(… AS UNSIGNED) function. Following example will demonstrate it −mysql> Select 0x54, CAST(0x54 AS UNSIGNED); +------+------------------------+ | 0x54 | CAST(0x54 AS UNSIGNED) | +------+------------------------+ | T | 84 | +------+------------------------+ 1 row in set (0.01 sec)
Read MoreHow can I create MySQL stored procedure with IN parameter?
To make it understand we are using the table named ‘student_info’ which have the following values −mysql> Select * from student_info; +-----+---------+------------+------------+ | id | Name | Address | Subject | +-----+---------+------------+------------+ | 101 | YashPal | Amritsar | History | | 105 | Gaurav | Jaipur | Literature | | 110 | Rahul | Chandigarh | History | | 125 | Raman | Shimla | Computers | ...
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