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What is the difference between “translate” and “replace”?
What is DYNAMIC SQL method 4?
How to remove duplicate records from a table?
What is the use of ANALYZing the tables?
How to run SQL script from a Unix Shell?
What is a “transaction”? Why are they necessary?
Explain Normalizationa dn Denormalization with examples.
When do you get contraint violtaion? What are the types of constraints?
How do you implement one-to-one, one-to-many and many-to-many relationships while designing tables?
One-to-One relationship can be implemented as a single table and rarely as two tables with primary and foreign key relationships.
One-to-Many relationships are implemented by splitting the data into two tables with primary key and foreign key relationships.
Many-to-Many relationships are implemented using a junction table with the keys from both the tables forming the composite primary key of the junction table.

What's the difference between a primary key and a unique key?
Both primary key and unique enforce uniqueness of the column on which they are defined. But by default primary key creates a clustered index on the column, where are unique creates a nonclustered index by default. Another major difference is that, primary key doesn't allow NULLs, but unique key allows one NULL only.

What are user defined datatypes and when you should go for them?
User defined datatypes let you extend the base SQL Server datatypes by providing a descriptive name, and format to the database. Take for example, in your database, there is a column called Flight_Num which appears in many tables. In all these tables it should be varchar(8). In this case you could create a user defined datatype called Flight_num_type of varchar(8) and use it across all your tables.

What is bit datatype and what's the information that can be stored inside a bit column?
Bit datatype is used to store boolean information like 1 or 0 (true or false). Untill SQL Server 6.5 bit datatype could hold either a 1 or 0 and there was no support for NULL. But from SQL Server 7.0 onwards, bit datatype can represent a third state, which is NULL.

Define candidate key, alternate key, composite key.
A candidate key is one that can identify each row of a table uniquely. Generally a candidate key becomes the primary key of the table. If the table has more than one candidate key, one of them will become the primary key, and the rest are called alternate keys.
A key formed by combining at least two or more columns is called composite key.

What are defaults? Is there a column to which a default can't be bound?
A default is a value that will be used by a column, if no value is supplied to that column while inserting data. IDENTITY columns and timestamp columns can't have defaults bound to them.
How to convert RAW datatype into TEXT?
Difference - Primary Key and Aggregate Key
How functional dependency is related to database table design?
What is a “trigger”?
Why can a “group by” or “order by” clause be expensive to process?
What are “HINTS”? What is “index covering” of a query?
What is a VIEW? How to get script for a view?
What are the Large object types suported by Oracle?
What is SQL*Loader?
Difference between “VARCHAR” and “VARCHAR2″ datatypes.
What are the different types of joins?
Explain normalization with examples.
What cursor type do you use to retrieve multiple recordsets?
Diffrence between a “where” clause and a “having” clause
What is the difference between “procedure” and “function”?
How will you copy the structure of a table without copying the data?

How to find out the database name from SQL*PLUS command prompt?
Tadeoffs with having indexes
Talk about “Exception Handling” in PL/SQL?
What is the diference between “NULL in C” and “NULL in Oracle?”
What is Pro*C? What is OCI?
Give some examples of Analytical functions.
What is the difference among “dropping a table”, “truncating a table” and “deleting all records” from a table.
Difference between “ORACLE” and “MICROSOFT ACCESS” databases.
How to create a database link?