To get the last N records in MongoDB, you need to use limit(). The syntax is as follows:db.yourCollectionName.find().sort({$natural:-1}).limit(yourValue);To understand the above syntax, let us create a collection with document. The query to create a collection with document is as follows:> db.getLastNRecordsDemo.insertOne({"EmployeeName":"Maxwell"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c6ecf3d6fd07954a4890689") ... Read More

An immutable copy of the Period object where some months are added to it can be obtained using the plusMonths() method in the Period class in Java. This method requires a single parameter i.e. the number of months to be added and it returns the Period object with the added ... Read More

Let us convert string type to int for an example. Aggregation does not allow us to directly change the type of a field; therefore, you need to write a code to convert the type of a field.At first, create a collection with document. After that we will get the type ... Read More

You can use aggregate framework to group by dates in MongoDB. Let us first create a collection with some documents. The query to create a collection with documents are as follows:> db.groupByDateDemo.insertOne({"UserLoginDateTime":new ISODate()}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c6ee4df6fd07954a4890695") } > db.groupByDateDemo.insertOne({"UserLoginDateTime":new ISODate("2019-01-31 15:20:09.234Z")}); {    "acknowledged" ... Read More

You can insert time values in SQL using the time datatype, The java.sql.Time class maps to the SQL Time type.The PreparedStatement interface provides a method named setTime(). Using this you can insert time into a table. This method accepts two parameters −An integer representing the parameter index of the place ... Read More

An immutable copy of the Period object where some years are added to it can be obtained using the plusYears() method in the Period class in Java. This method requires a single parameter i.e. the number of years to be added and it returns the Period object with the added ... Read More

To convert the string to date in MongoDB, use the following syntax:db.yourCollectionName.aggregate(    [       {          $project:          {             anyVariableName:             {                $dateFromString: ... Read More

The minute of the hour for a particular LocalTime can be obtained using the getMinute() method in the LocalTime class in Java. This method requires no parameters and it returns the minute of the hour in the range of 0 to 59.A program that demonstrates this is given as followsExample Live ... Read More

An immutable copy of the Period object where some days are subtracted from it can be obtained using the minusDays() method in the Period class in Java. This method requires a single parameter i.e. the number of days to be subtracted and it returns the Period object with the subtracted ... Read More

Intel 8255 is a peripheral interface (PPI) chip which is programmable. It is used for the connection of peripheral devices and interfacing. We call Peripheral device also as Input Output device. We use Input Output ports for the connection of Input Output devices. Hence 8255 is a programmable Input Output ... Read More