Answer:
Join
Explanation:
Five basic set operators in relational algebra are as follows:
- Selection - tuple selection
- Projection - extract columns
- Cartesian product - cross product of relations
- Set union - union of two relations
- Set difference - minus operation on two relations
As we can see, Join is not part of the basic set operations but it is implemented using the Cartesian Product operator.
Answer and Explanation:
Given that total number of records in a file = 100000
Each record consists of= 240 bytes
Given that B= 2400 bytes.
Then total blocks in file = 100000 records * 240 / 2400
= 10000 blocks.
Time that will take for exhaustive read
= s + r + b.btt
= 16 + 8.3 + (10000) * 0.8
= 8024.3 msec
Now as per given X be the number of records that are searched randomly and it takes more than exhaustive read time.
Hence, X (s + r + btt) > 8024.3
X (16+8.3+0.8) > 8024.3
X > 8024.3/25.1
So that, X > 319.69
Hence, atleast 320 random reads should be made to search the file
The answer is Fourth-generation language (4GL). <span>Sql is an example of a 4GL category programming language. </span>SQL<span> is considered a Fourth-generation </span>language<span> (</span>4GL), whereas Java and C++ are third-generation languages<span> (3GLs). Fourth-generation </span>languages<span> are programming </span>languages<span> that are closer to human </span>language<span> than the high-level </span>languages<span> like Java.</span>
Answer:
The definition of the issues is listed throughout the section down.
Explanation:
- Stranded cables are somewhat more compact and can be mounted quickly. Strong cables become rigid in design, and they are not versatile for installation. In comparison with solid connectors, amplification is indeed high.
- Unless the innermost layer including its wire is broken as we attempt to connect the cable, it will not function. So, whenever stripping the cables through the walls, it's indeed important not to rank the jack too profoundly.
- It would be quick to untwist the cable and then will ensure that perhaps the connection is appropriate for the most widely encountered rj-45 connection whenever the wiring of 0.5 inches becomes coupled up.
- If we don't keep the right pin colors in order, the relation won't work. Afterward, when another connexon is broken due to many complications, it would be impossible to figure out the contacts unless the pins coloring are not always in sequence.
- The connection pairs can be cut off through 0.5 inches within about therefore the gap within the connector is narrower and the wire would not be correctly attached if we break the cable further. The link is lost and the cable does not run properly.
- It is necessary to ensure that perhaps the wires are forced to the end of the platform since the connexon will indeed be broken as well as the connector would not operate unless the wires aren't moved. The wires will fall out of another socket as well.
- Before even being incorporated into another crimping unit, it is good to carefully check the connection sequence to ensure that perhaps the wires are to the end since it is impossible to verify the sequence until the wires are attached to something like the connector. Unless the connections are not always in alignment, the link will also not be provided and indeed the wire would not operate correctly, even if the link is provided. Such wires can also be presented to use load barriers, and that it's the simplest operation.
- The Durability Tester has been used to determine the hardness between two stages, whereas the connection efficiency is tested using the qualification tester.
If you have related data stored in multiple tables, create a Data model to<span> produce a pivot table on the combined data.
In computer term, data model refers to how each data are connected to one another and how those connections are being processed within the Sysyem</span>
