What is Catalog Views?

Correct Answer: Properties of Sub-Query - A sub-query must be enclosed in the parenthesis - A sub-query must be put in the right hand of the comparison operator, and - A sub-query cannot contain an ORDER-BY clause - A query can contain more than one sub-query Types of Sub-Query - Single-row sub-query, where the sub-query returns only one row - Multiple-row sub-query, where the sub-query returns multiple rows, and - Multiple column sub-query, where the sub-query returns multiple columns

Correct Answer: User defined data-types in SQL is an extension to the base SQL server data-types by provision of a descriptive name We use them to format the database and segregate specific repetitions of rows and columns in the database

Correct Answer: The knowledge of Joins is a MUST for every interviewee Most SQL programmers have used inner join and outer join[left/right]; but the catch point here is to also mention cross join and self-join

Correct Answer: SQL JOIN allows access to records of other table based on the given conditions between two tables Ex: If we are provided with the department ID of each employee, then we can use the department ID of the employee table to merge with the department ID of the department table to access department names UNION operation allows addition of 2 similar data sets to create a resulting set that contains all the data from the source data sets Ex: If we are provided with 2 employee tables of the same structure, we can UNION them to create a singular result that will contain all employee from both the table

Correct Answer: In a nutshell, a temp table is a temporary storage structure It means you can use a temp table to store data temporarily so you can manipulate and change it before it reaches its destination format In table_usergender column change ?male to female? and ?female to male? in one SQL statement UPDATE table_user SET gender = CASE gender WHEN ?male? THEN ?female? WHEN ?female? THEN ?male? ELSE gender END

Correct Answer: Company Info > Alter

Correct Answer: All of the above

Explanation:

A database is used to store, modify, extract and to search for the data within it.

Correct Answer: All of the above

Explanation:

In SQL, a SQL view is a virtual table based on the result-set of an SQL statement. A view contains rows and columns, just like a real table.

 

SQL views can be used to hide rows and columns and complicated SQL syntax.

 

The fields in a view are fields from one or more real tables in the database.

Correct Answer: Sorting

Explanation:

The process of arranging any items in a systematic manner in a logical sequence is called as Sorting. It can be of two types :

1. Ordering

Arranging items following some criterion like ascending or descending order

2. Categorizing

Grouping items with similar properties together.

Correct Answer: To format the ABAP code 'pretty printer' is used