Question: Explain the meaning of the SQL EXISTS comparison operator.

Explain the meaning of the SQL EXISTS comparison operator.

Step by Step Solution

★★★★★

3.21 Rating (162 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock

EXISTS is a logical operator ... View full answer

blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Database Processing Fundamentals Questions!

Q:

Answer Review Question 8.10, but use the SQL EXISTS comparison operator.

Q:

Explain the meaning of each of the transaction isolation levels under Options shown in Figure 10C-82. Scope Options Transaction isolation level GLOBAL READ UNCOMMITTED SESSION READ COMMITTED...

Q:

A cellular operator needs a database to keep track of its customers, their subscription plans, and the handsets (mobile phones) that they are using. The E-R diagram in Figure 2-24 illustrates the key...

Q:

8.2 Describe why database redesign is necessary. 8.11 Explain the meaning of the SQL EXISTS comparison operator. 8.18 Explain the process of reverse engineering. 8.25 Describe the process of changing...

Q:

the following relational algebra questions based on tables S1 and S2 (below) Question 1 What is the output of S1 S2 ? The row identified by sid 22 The rows identified by sid 31 and 58 The row...

Q:

Before starting these problems, update the JustLee Books database by executing the JLDB _ Build _ 9 . sql script, otherwise, your solutions might not work! Note: In this module, it is assumed that...

Q:

Please provide just queries for all the questions below Problem 1: Write an SQL query to join three related tables using JOIN ON in the JustLee Books. Select four-five columns that you would like to...

Q:

This looks long but is multiple selection question. Takes only few mintues. Question 1 The following are all valid locations in an SQL query for a subquery. According to the text, which is the most...

Q:

This looks long but is multiple selection question. Takes only few mintues. Question 1 The following are all valid locations in an SQL query for a subquery. According to the text, which is the most...

Q:

1. SQL Data Definition Language (For each of the questions below, Solve and explain how you got the answer in your words) 1.1. Create a base table. Write the SQL to create a table based on one of...

Q:

Suppose we believe the cash revenues from our fertilizer business will be $20,000 per year, assuming everything goes as expected. Cash costs (including taxes) will be $14,000 per year. We will wind...

Q:

What would have been the present value of the Croydon Corp. interest tax savings if the company planned to permanently maintain its indebtedness at the 2014 level? Assume an interest rate of 6.5% and...

Q:

protit margm is 5 % , ts debt ratio is 5 6 % , and its dividend payout ratio is 4 0 % . If the firm is operating at less than full capacity, then sales could increase to some extent without the need...

Q:

1.14 What guidelines are available for deciding on the form and layout of a questionnaire?

Q:

Suppose T is a multiway tree in which each internal node has at least five and at most eight children. For what values of a and b is T a valid (a,b) tree?

Q:

Consider an initially empty memory cache consisting of four pages. How many page misses does the FIFO algorithm incur on the following page request sequence: (2,3,4,1,2,5,1,3,5,4,1,2,3)?

Q:

Karen has a new way to do path compression in a tree-based union/find partition data structure starting at a position p. She puts all the positions that are on the path from p to the root in a set S....

Q:

1. a) b) Patrice owes $39,000 now. A lender will carry the debt for eight more years at 9 percent interest. That is, in this particular case, the amount owed will go up by 9 percent per year for...

Q:

At the beginning of last year, Thomas purchased 4 0 0 shares of the web.com fund at an NAV of $ 1 6 . 7 1 and automatically reinvested all distributions as a result of reinvesting, Thomas end of the...

Q:

Morris Glass Company has decided to invest funds for the next 5 years so that development of smart glass is well funded in the future. This type of new-technology glass uses electrochrome coating to...