Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Database Articles
Page 432 of 547
MySQL 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 ...
Read MoreCan we replace all the digits of column values to zero except the first digit?
Yes, we can replace all the digits of column values to zero except the first digit. Let us first see an example and create a table −mysql> create table DemoTable744 (Number varchar(100)); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable744 values('537737736252'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable744 values('989000099999'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable744 values('343225666666664533'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable744 values('4322111899494'); Query OK, 1 row affected (0.15 sec)Display all records from the table ...
Read MoreMySQL query to keep only first 2 characters in column value and delete rest of the characters?
To keep only first two characters and delete rest of the characters, use SUBSTRING().Let us first create a table −mysql> create table DemoTable743 (SubjectName varchar(100)); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable743 values('MySQL'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable743 values('Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable743 values('MongoDB'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable743 values('Python'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable743 values('Data Structure'); Query OK, 1 row affected (0.68 ...
Read MoreFind the records with % character in a LIKE query with MySQL
Let us first create a table −mysql> create table DemoTable742 (Value varchar(100)); Query OK, 0 rows affected (2.91 sec)Insert some records in the table using insert command −mysql> insert into DemoTable742 values('632535MIT'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable742 values('US%UK'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable742 values('56%78'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable742 values('%_1234'); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select *from DemoTable742;This will produce the following output -+-----------+ | Value | ...
Read MoreHow to subtract the same amount from all values in a column with MySQL?
Let us first create a table −mysql> create table DemoTable741 (Number int); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable741 values(70); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable741 values(55); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable741 values(89); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable741 values(79); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable741 values(34); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable741;This will ...
Read MoreFind records with double quotes in a MySQL column?
Use LIKE to find records with double quotes. Following is the syntax −select *from yourTableName where yourColumnName LIKE '%"%';Let us first create a table −mysql> create table DemoTable740 (Value varchar(100)); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable740 values("""); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable740 values(""John"); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable740 values("Sam"); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable740;This will produce the following output -+-------+ | ...
Read MoreFinding the sum of integers from multiple MySQL rows in same column?
Let us first create a table −mysql> create table DemoTable739 (Price int); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable739 values(100); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable739 values(50); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable739 values(1200); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable739 values(500); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable739 values(800); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable739;This will ...
Read More