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MySQLi Articles
Page 101 of 341
Fetch how many people are registering on the current date with MySQL
For this, you can use COUNT() along with GROUP BY MONTH(). To match with the current date, use CURRENT_DATE(). The current date is as follows −mysql> select curdate() ; +------------+ | curdate() | +------------+ | 2019-11-30 | +------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable1819 ( Name varchar(20), RegisteringDate datetime ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1819 values('Chris', '2019-11-29 12:30:34'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1819 ...
Read MoreCheck for NULL or empty variable in a MySQL stored procedure
To check for NULL or empty variable, use the IF condition. Let us create a stored procedure −mysql> delimiter // mysql> create procedure checkingForNullDemo(Name varchar(20)) begin if Name is NULL OR Name='' then select 'Adam Smith'; else select Name; end if ; end // Query OK, 0 rows affected (0.00 sec) mysql> delimiter ;Case 1When NULL is passed. Call the stored procedure using call commandmysql> call checkingForNullDemo(NULL);This will produce the following output −+------------+ | Adam Smith | +------------+ | Adam Smith | +------------+ 1 ...
Read MoreHow to use comparison operator for numeric string in MySQL?
To use comparison operator for numeric string, use the substring() method. Let us first create a table −mysql> create table DemoTable1881 ( UserId int, UserEducationGap varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1881 values(101, '5-9'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(102, '2-4'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(103, '4-8'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1881 values(104, '7-12'); Query OK, 1 row affected (0.00 sec)Display all records ...
Read MoreHow MySQL stored GENERATED COLUMNS can work with mathematical expressions?
It can be illustrated with the help of an example in which we are creating a stored generated column in the table named ‘triangle_stored’. As we know that stored generated column can be generated by using the keyword ‘stored’.Examplemysql> Create table triangle_stored(SideA DOUBLE, SideB DOUBLE, SideC DOUBLE AS (SQRT(SideA * SideB + SideB * SideB)) STORED); Query OK, 0 rows affected (0.47 sec) mysql> Describe triangle_stored; +-------+--------+------+-----+---------+------------------+ | Field | Type | Null | Key | Default | Extra | +-------+--------+------+-----+---------+------------------+ | SideA | double | ...
Read MoreHow Can MySQL virtual GENERATED COLUMNS work with built-in functions?
It can be illustrated with the help of an example in which we are creating a virtual generated column in the table named ‘employee_data’. As we know that virtual generated column can be generated with or without using the keyword ‘virtual’.Examplemysql> Create table employee_data(ID INT AUTO_INCREMENT PRIMARY KEY, First_name VARCHAR(50) NOT NULL, Last_name VARCHAR(50) NOT NULL, FULL_NAME VARCHAR(90) GENERATED ALWAYS AS(CONCAT(First_name, '', Last_name))); Query OK, 0 rows affected (0.55 sec) mysql> DESCRIBE employee_data; +------------+-------------+------+-----+---------+-------------------+ | Field | Type ...
Read MoreHow can we compare data in two MySQL tables?
Sometimes we need to identify the unmatched data from two tables, especially in the case when data is migrated. It can be done by comparing the tables. Consider the example below in which we have two tables named ‘students’ and ‘student1’.mysql> Select * from students; +--------+--------+----------+ | RollNo | Name | Subject | +--------+--------+----------+ | 100 | Gaurav | Computer | | 101 | Raman | History | | 102 | Somil | Computer | +--------+--------+----------+ 3 rows in set (0.00 sec) mysql> select * from student1; +--------+--------+----------+ | RollNo | Name | Subject | ...
Read MoreCan we use MySQL GROUP BY clause with multiple columns like MySQL DISTINCT clause is used?
Yes, it is possible to use MySQL GROUP BY clause with multiple columns just as we can use MySQL DISTINCT clause. Consider the following example in which we have used DISTINCT clause in first query and GROUP BY clause in the second query, on ‘fname’ and ‘Lname’ columns of the table named ‘testing’.mysql> Select * from testing; +------+---------+---------+ | id | fname | Lname | +------+---------+---------+ | 200 | Raman | Kumar | | 201 | Sahil | Bhalla | | 202 | Gaurav | NULL | | 203 | Aarav | ...
Read MoreWhy it shows 0 instead of empty string whenever I insert an empty string into a MySQL column which is declared as NOT NULL?
It is because inserting an empty string means that we are inserting some value and not NULL. The empty string apparently maps to zero as an integer. In other words, we can say that by inserting empty string we are providing a value to MySQL that has integer representation as INT 0. Consider the following example in which we inserted an empty string and it mapped to 0 by MySQL.mysql> create table test(id int NOT NULL, Name Varchar(10)); Query OK, 0 rows affected (0.19 sec) mysql> Insert into test(id, name) values('1', 'Gaurav'), ('0', 'Rahul'), ('', 'Aarav'); Query OK, 3 ...
Read MoreHow can we find out the current transaction mode in MySQL?
We can run “SELECT @@AUTOCOMMIT” command to check the current transaction mode.mysql> Select @@AUTOCOMMIT; +--------------------+ | @@AUTOCOMMIT | +--------------------+ | 1 | +--------------------+ 1 row in set (0.05 sec) mysql> SET AUTOCOMMIT = 0; Query OK, 0 rows affected (0.00 sec) mysql> Select @@AUTOCOMMIT; +--------------------+ | @@AUTOCOMMIT | +--------------------+ | 0 | +--------------------+ 1 row in set (0.00 sec)
Read MoreWhat happens if MySQL query returns no rows?
From the output returned by MySQL, it is very much clear that how many rows are there in the result set along with the execution time.ExampleFor example, in the following MySQL output we can see there are 3 rows in the result set.mysql> Select * from ratelist ORDER BY Price LIMIT 3; +----+------+-------+ | Sr | Item | Price | +----+------+-------+ | 5 | T | 250 | | 1 | A | 502 | | 2 | B | 630 | +----+------+-------+ 3 rows in set (0.00 sec)But suppose if MySQL query has ...
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