1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vovangra [49]
2 years ago
5

Which of the following is a valid SQL statement?

Computers and Technology
1 answer:
scZoUnD [109]2 years ago
6 0

Answer:

Hi!

The correct answer is B.

Explanation:

This sentence SELECT * FROM customers JOIN orders ON (customer#) selects all the columns of both customers and orders and joins by the name of the column customer.

A and B options have syntactic problems:  

  • A and C: Same alias name for multiple tables.

  • A and C: Selected columns are ambiguous.

  • C: refers to an alias not declared on the FROM sentence.

a) SELECT c.customer#, order#, orderdate, shipdate(omits aliases) FROM customers c NATURAL JOIN orders c(same aliases definiton);

c) SELECT c.customer#, order#, orderdate, shipdate(omits aliases) FROM customers c, orders c(same aliases definiton) WHERE c.customer# = o.customer#(o not declared);

You might be interested in
Java-Script Concept quiz:
In-s [12.5K]

Answer:

Explanation:

1) the versions of JavaScript that are fully supported by all modern browsers ( Except internet explorer 9) are:

C. ECMAScript 3, ECMAScript 5

2) JavaScript is used to implement complex features on a_____

A. web page

3) computer programming tools that are used to store data are called____

C. variables

4) var name = Scott; is the code to create a ____ called "Scott"

D. None of the above

Scott is a variable

5) the key difference between "var" and "let" variables is that____

D. None of the above  

let is used to redefine a variable by using var to redefine may cause problems

6) Hoisting in JavaScript is the process whereby declarations get moved to the____

C. top

7) Im JavaScript, "/ /" is used to code____

A. comments

8) ______ data types have two potential values - true and false.

D. None of the above

Boolean is the data type and null is always false

9) Using ____ gives coders the ability to query data set data to create blueprints.

C. consoles

The Console object provides access to the browser's debugging console.

5 0
3 years ago
How do online note-taking tools support students’ academic goals? Check all that apply.
MakcuM [25]

Answer:

all but 3

Explanation:

3 is strange and I need points sorry

5 0
3 years ago
Read 2 more answers
In modern computer systems, a byte consists of
Cerrena [4.2K]
8 smaller units, called bits :)
8 0
3 years ago
Before her shift as a cashier at the grocery store, Carla pulls her hair back into a ponytail and makes sure her fingernails are
Kobotan [32]

Answer:

is shows that the cashier has a good habit and has a good sense of hygiene

3 0
3 years ago
Write 3 3 advantage and disadvantage of computer​
navik [9.2K]

Answer:

Advantages: computers don't make human error

It can be used for communication

Ease of access

Disadvantages: computers can be a distraction

Potential loss of privacy

It can limit learning and create a dependency

8 0
2 years ago
Other questions:
  • What was the first browser that allowed for graphics to be viewed on the web?
    14·2 answers
  • kevin is working on a financial project that involves a lot of statistical information. He needs software that allows him to ent
    8·2 answers
  • A result of the Gibbons v. Ogden (1824) decision was that states​
    11·1 answer
  • How to access files on different computer same network
    14·1 answer
  • In this mode, your presentation will fill up the entire screen. Auto Default Standard Window
    6·2 answers
  • Who is the founder of javascript? ​
    14·2 answers
  • Differences between electromechanical era and electronic era in point.<br>PLZ HELP​
    6·1 answer
  • Many of the first photographers were actullay scientists and inventors
    11·1 answer
  • Give one example of where augmented reality is used​
    11·2 answers
  • Choose the best type of loop for each situation.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!