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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to check an empty table already in a MySQL database?
To check an empty table is in a database, you need to extract some records from the table. If the table is not empty then the table records would be returned.Let us first create a table −mysql> create table DemoTable(Id int, Name varchar(100), Age int); Query OK, 0 rows affected (0.80 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1001, 'John', 23); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(1002, 'Chris', 21); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(1003, 'David', 22); Query OK, 1 row affected ...
Read MoreHow to order by auto_increment in MySQL?
Let us first create a table −mysql> create table DemoTable(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100)); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(FirstName) values('Robert'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(FirstName) values('David'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(FirstName) values('Carol'); Query OK, ...
Read MoreFacing difficulty in removing the apostrophe in MySQL stored procedure?
To remove apostrophe, replace it. For this, you can use REPLACE(). Following is the syntax −SET anyVariableName = REPLACE(yourVaribleName , ''', '');To understand the above syntax, let us create a stored procedure to remove the apostrophe in MySQL −mysql> DELIMITER // mysql> CREATE PROCEDURE remove_Apostrophe(IN Value VARCHAR(200)) BEGIN SET Value = REPLACE(Value , ''', ''); SELECT CONCAT("AFTER REMOVING APOSTROPHE THE STRING IS= ", Value); END // Query OK, 0 rows affected (0.15 sec) mysql> DELIMITER ;Call the stored procedure using CALL command −mysql> CALL remove_Apostrophe("Introduction to My'SQL");This will produce the following ...
Read MoreMySQL isn't inserting binary data properly? Which datatype should be used?
For this, use BIT data type. Let us first create a table −mysql> create table DemoTable(binaryValue BIT(5)); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(15); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output. Now you can see the records aren’t visible −+-------------+ | binaryValue | +-------------+ | | | ...
Read MoreMySQL float data field not accepting every float number? How to fix this?
To get fixed float data type, use DECIMAL(). This will fix the issue of unacceptance. Let us first create a table −mysql> create table DemoTable(Amount DECIMAL(10, 2)); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(2194848.90); Query OK, 1 row affected (0.65 sec) mysql> insert into DemoTable values(90309393.79); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(8999999.68); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(90900000.99); Query OK, 1 row affected (0.26 sec)Display all records from the table using select statement −mysql> select ...
Read MorePrint leaf nodes in binary tree from left to right using one stack in C++
Program should print the leaf nodes of a binary tree from left to right but the challenge involves is using of only one stackThrough push() function insert nodes of a binary tree and through pop() operation display the leaf nodes.Leaf nodes are the end nodes whose left and right pointer is NULL which means that particular node is not a parent node.ExampleInput : 12 21 32 41 59 33 70 Output : 41 59 33 70Stack is a data structure which is a LIFO structure in which top pointer will point to the last elements inserted so the leaf nodes ...
Read MoreMySQL to perform DateTime comparison and find the difference between dates in different columns
For this, use DATEDIFF() function. Let us first create a table −mysql> create table DemoTable(DOB datetime, CurrentDate datetime); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('1995-01-21', CURDATE()); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('1998-11-01', CURDATE()); Query OK, 1 row affected (0.39 sec) mysql> insert into DemoTable values('2000-10-24', CURDATE()); Query OK, 1 row affected (0.22 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+---------------------+ | DOB ...
Read MoreHow to sort by arbitrary keywords in MySQL?
For this, use the ORDER BY FIELD() ASC. Let us first create a table −mysql> create table DemoTable(Title varchar(100)); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('C'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Python'); Query OK, 1 row affected (0.63 sec) mysql> insert into DemoTable values('MongoDB'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------+ ...
Read MoreMySQL query to retrieve only the column values with special characters?
For this, use REGEXP. Let us first create a table −mysql> create table DemoTable(SubjectCode varchar(100)); Query OK, 0 rows affected (0.89 sec)Insert some records in the table using insert command. The records consists of text, numbers and special characters −mysql> insert into DemoTable values('Java899@22'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('C#'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('~Python232'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('MongoDB%'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('C123456'); Query OK, 1 row affected (0.37 sec)Display all ...
Read MoreHow to retrieve a value with MySQL count() having maximum upvote value?
Let’s say we have some columns in the table, one for image path and another for the upvotes. However, the first column is the auto increment Id as shown below −mysql> create table DemoTable( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ImagePath varchar(100), UpvoteValue int ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ImagePath, UpvoteValue) values('Image1.jpeg', 90); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(ImagePath, UpvoteValue) values('Image2.jpeg', 10); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(ImagePath, UpvoteValue) values('Image3.jpeg', 120); Query OK, 1 ...
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