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MySQL Articles
Page 85 of 355
In MySQL, what is Bit-field notation and how it can be used to write bit-field value?
Bit-field notation is the notation with the help of which we can write bit-field values. The syntax of Bit-field notation is as follows −Syntaxb’value’ OR 0bvalueHere, the value is a binary value written by using zeros and ones.The mainly Bit-filed notation is convenient for specifying values to be assigned to BIT columns of MySQL table. Following example will demonstrate it −mysql> Create table bit_testing (bittest BIT(8)); Query OK, 0 rows affected (1.09 sec) mysql> INSERT INTO bit_testing SET bittest = b'10101010'; Query OK, 1 row affected (0.07 sec) mysql> INSERT INTO bit_testing SET bittest = b'0101'; Query ...
Read MoreWhat is the default type of a bit value assigned to user variables?
By default, the bit values assigned to the user variables are binary strings. It can be illustrated by assigning the bit value to a user variable and then by retrieving them as follows −mysql> SET @abc = 0b1000011; Query OK, 0 rows affected (0.00 sec) mysql> Select @abc; +------+ | @abc | +------+ | C | +------+ 1 row in set (0.00 sec)The above result set shows that the default type of a bit value assigned to user variables are binary strings.
Read MoreHow can we display MySQL bit values in printable form?
Actually, Bit values are returned as binary values but we can also display them in the printable form with the help of following −By adding 0We can display Bit values in printable form by adding 0 to them. Following the example from the bit_testing table can be used to understand it −mysql> Select bittest+0 from bit_testing; +-----------+ | bittest+0 | +-----------+ | 170 | | 5 | | 5 | +-----------+ 3 rows in set (0.00 sec)By using ...
Read MoreHow can I create a stored procedure to delete values from a MySQL table?
We can create a stored procedure with IN operator to delete values from 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 ...
Read MoreHow 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 ...
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