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What is the use of sub queries?
A sub query is a select-from-where expression that is nested with in another query. A common use of sub queries is to do tests for set membership, make set comparisions, and verify set cardinality.
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples
When is UPDATE_STATISTICS command used? - When processing of large data is done, this command is used. - Whenever large number of modification, deletions or copy takes place
Describe the static hash file with buckets and chaining and show how insertion, deletion and modification of a record can be performed. In static hash file organization, the wo
List the string operations supported by SQL? 1) Pattern matching Operation 2) Concatenation 3) Extracting character strings 4) Converting among uppercase and lower cas
WOUND-WAIT
Define weak and strong entity sets? Weak entity set: entity set that do not have key attribute of their own are known as weak entity sets. Strong entity set: Entity set that
write an SQL statement to create the database in MYSQL server
Data Control The data control mostly refers to commands that permit system and data privileges to be passed to several users. These commands are usually available to database admi
Have database built but having problems with some questions that go with the database
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