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Articles by Chandu yadav
Page 58 of 81
How to add a where clause in a MySQL Insert statement?
You need to use UPDATE statement for this.The syntax is as followsupdate yourTableName set yourColumnName1=yourValue1, yourColumnName2=yourValue2, ....N where yourCondition;Let us create a table for our examplemysql> create table addWhereClauseDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(30), -> StudentPassword varchar(40) -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into addWhereClauseDemo(StudentName, StudentPassword) values('John', 'John123456'); Query OK, 1 row affected (0.14 sec) mysql> insert into addWhereClauseDemo(StudentName, StudentPassword) values('Carol', '99999'); Query OK, 1 row affected (0.24 sec) mysql> insert ...
Read MoreUpdate one column data to another column in MySQL if the second column is NOT NULL?
To update one column data to another column, you can use UPDATE command. Let us first create a table −mysql> create table DemoTable ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserFirstName varchar(20), ListOfName varchar(20) ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserFirstName, ListOfName) values('John', 'Larry'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable(UserFirstName, ListOfName) values('Carol', null); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(UserFirstName, ListOfName) values('David', 'Sam'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(UserFirstName, ListOfName) ...
Read More8086 program to find the min value in a given array
In this program we will see how to find the minimum number in a given array.Problem StatementWrite 8086 Assembly language program to find the minimum number in a given array, which is starts from memory offset 501. The size of the series is stored at memory offset 500. Store the minimum number at memory offset 600.DiscussionAt first we are taking the size of the array from memory offset 500. Then using that size, we are initializing the counter to read and check all the numbers. We are taking the first number into AL, then check each number and compare it ...
Read MoreCan we select second largest record from a table without using LIMIT clause in MySQL?
Yes, we can select second largest record from a table without using LIMIT clause. Let us first see an example and create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.66 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(78); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(67); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(92); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(98); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(88); ...
Read MoreHow to update date of datetime field with MySQL?
Update date of datetime field with the help of arithmetic operator minus(-).The syntax is as followsupdate yourTableName set yourDateTimeColumnName=yourDateTimeColumnName - interval yourValue day where date(yourDateTimeColumnName)=’yourDateValue’;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table updateDateDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ArrivalDate datetime -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into updateDateDemo(ArrivalDate) values('2011-01-13'); Query OK, 1 row affected (0.19 sec) mysql> insert into updateDateDemo(ArrivalDate) values('2013-04-21'); ...
Read MoreFinding highest value from sub-arrays in MongoDB documents?
To find the highest value from sub-arrays in documents, you can use an aggregate framework. Let us first create a collection with documents> db.findHighestValueDemo.insertOne( ... { ... _id: 10001, ... "StudentDetails": [ ... { "StudentName": "Chris", "StudentMathScore": 56}, ... { "StudentName": "Robert", "StudentMathScore":47 }, ... { "StudentName": "John", "StudentMathScore": 98 }] ... } ... ); { "acknowledged" : true, "insertedId" : 10001 } > db.findHighestValueDemo.insertOne( ... { ... _id: 10002, ... "StudentDetails": [ ...
Read MoreC program to write an image in PGM format
The PGM is the Portable Gray Map. If we want to store a 2d array in C as images in PNG, JPEG, or any other image format, we have to do lots of work to encode the data in some specified format before writing into a file.The Netpbm format gives an easy and portable solution. The Netpbm is an open source package of graphics program and it is used basically in linux or Unix platform. It also works under Microsoft Windows systems.Each file starts with a two-byte magic number. This magic number is used to identify the type of the ...
Read MoreMySQL Stored Procedure DEFINER=`root`@`%` is not working in localhost?
First of all, you need to check the host. The host can be ‘localhost’ or ‘%’. Check the existence of user accounts with host −mysql> select user, host from MySQL.user;This will produce the following output −+------------------+-----------+ | user | host | +------------------+-----------+ | Bob | % | | User2 | % | | mysql.infoschema | % | ...
Read MoreMySQL UPDATE query where id is highest AND field is equal to variable?
The syntax is as followsupdate yourTableName set yourColumnName1=yourValue where yourColumnName2=yourValue order by yourIdColumnName DESC LIMIT 1;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table UpdateWithHighestDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserStatus tinyint, -> UserRank int -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command.The query is as followsmysql> insert into UpdateWithHighestDemo(UserStatus, UserRank) values(1, 78); Query OK, 1 row affected (0.12 sec) mysql> insert into UpdateWithHighestDemo(UserStatus, UserRank) values(0, 118); Query ...
Read MoreHow to search for a date in MySQL timestamp field?
You can use DATE() function from MySQL for this. Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentAdmissionDate timestamp ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentAdmissionDate) values('2011-01-12 12:34:43'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(StudentAdmissionDate) values('2012-10-23 11:32:21'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(StudentAdmissionDate) values('2001-02-14 05:12:01'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(StudentAdmissionDate) values('2018-12-31 15:10:04'); Query OK, 1 row affected (0.22 sec) mysql> ...
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