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
Articles by AmitDiwan
Page 778 of 840
Delete selective multiple records using MySQL DELETE query
For selective multiple records, use MySQL IN(). To delete them, use MySQL DELETE. Let us first create a table −mysql> create table DemoTable ( ClientId varchar(40), ClientName varchar(50) ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('CLI-101', 'Chris'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('CLI-110', 'Adam'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('CLI-220', 'Mike'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('CLI-120', 'Bob'); Query OK, 1 row affected (0.53 sec) mysql> insert ...
Read MoreHow to check if any of the strings in a column contains a specific string in MySQL?
For this, use CONCAT() along with LIKE operator. Let us first create a table −mysql> create table DemoTable ( Name varchar(40) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Johnson'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.12 sec)Display all records ...
Read MorePerform NAND/NOR operations in MySQL
Let us first see how we can perform NAND/NOR operations in MySQL. The concept is as follows −NAND= NOT( yourColumnName1 AND yourColumnName2) NOR=NOT( yourColumnName1 OR yourColumnName2)Let us first create a table −mysql> create table DemoTable ( Value1 boolean , Value2 boolean ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(true, true); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(false, false); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(false, true); Query OK, 1 row affected (0.10 sec) mysql> insert ...
Read MoreDisplay records from the current date till rest of the same month in MySQL?
Let us first create a table −mysql> create table DemoTable ( BookingDate date ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-09-21'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('2018-09-10'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('2019-09-10'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2019-09-08'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2016-09-18'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select ...
Read MoreMySQL query to group by names and display the count in a new column
Use GROUP BY with the COUNT() method. Group the names with GROUP BY and count using the COUNT() method. Let us first create a table −mysql> create table DemoTable ( Name varchar(30) ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.07 sec) mysql> insert into ...
Read MoreNeed to populate autocomplete with records on the basis of first and last name of schools in MySQL?
To populate autocomplete, use the LIKE clause in MySQL. Let us first create a table −mysql> create table DemoTable ( SchoolName varchar(100) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Horce Greeley'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Conestoga Senior'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Adlai E.Stevenson'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Thomas Jefferson'); Query OK, 1 row affected (0.07 sec)Display all records from the table using select statement :mysql> ...
Read MoreDisplay NULL and NOT NULL records except a single specific value in MySQL
To display NULL records, use IS NULL in MySQL. To ignore a single value, use the != operator , which is an alias of the operator.Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, PlayerName varchar(40) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −p>mysql> insert into DemoTable(PlayerName) values('Adam'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(PlayerName) values(NULL); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(PlayerName) values('Sam'); Query OK, 1 row affected (0.13 sec) ...
Read MoreMySQL throws an error when the table name "match" is not surrounded by single quotes?
Do not use single quotes. You need to use backticks around the table name match, since it is a reserved name in MySQL. Following is the error that occurs :mysql> select *from match; ERROR 1064 (42000) : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'match' at line 1Let us first create a table and fix the occurrence of the above error using backticks around the reserved word match, used here as table name −mysql> create table `match` ( Id int NOT ...
Read MoreFix MySQL ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key
To fix this error, you need to add PRIMARY KEY to auto_increment field. Let us now see how this error occurs −Here, we are creating a table and it gives the same error −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT, StudentName varchar(40), StudentAge int ); ERROR 1075 (42000) : Incorrect table definition; there can be only one auto column and it must be defined as a keyTo solve the above error, you need to add PRIMARY KEY with AUTO_INCREMENT. Let us first create a table −mysql> create table DemoTable ( StudentId int NOT ...
Read MoreGet Nth weekday of the month from a column with DATE records in MySQL
We need to find the weekday i.e. week 1 from date 1 to 7, week 2 from date 8 to 14, etc. To get the day, use DAY() function in MySQL. Set the conditions to get the weekday (number) using CASE statement.Let us now see an example and create a table −mysql> create table DemoTable ( AdmissionDate date ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-09-12'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('2019-09-06'); Query OK, 1 row affected (0.16 sec) mysql> ...
Read More