Top PL-SQL Interview Question and Answers forVarchar can store upto bytes and varchar2 can store upto bytes. Both are differed with respect to space. RAW datatype is used to store values in binary data format. The maximum size for a raw in a table in bytes. It also hold entire sub table. If all values in the list are null, then the coalesce function will return NULL.
Important Oracle Interview Questions with Answers
Ans: Whenever a new database is created, queries involved in such databases are generally simple! Both are differed with respect to space. Apply hash value on the table to retrieve the rows from the table.Syntax:Select col1,col2…from table1; Intersect Select col1,col2…from table2. Both Char and Varchar2 are used for characters datatype but varchar2 is used for character strings of variable length whereas Char is used for strings of fixed length! A cursor variable is associated with questione statements which can hold different values at run time. The only disadvantage of Stored Procedure is that it can be executed only in the database and utilizes more memory in the database server.
Q 21 What is the use of Aggregate functions in Oracle. Question 8. You can rollback data after using delete statement. If one table contains Employee edveloper its position?
Here are the top 40 Oracle interview questions along with answers covering almost all the basic concepts of Oracle. Most of the basics are explained here along with simple examples for your easy understanding. It is advisable to go through the below set of questions if you are planning to appear for an interview.
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Q 17 What is the quickest way to fetch the data from a table. Can you list a few of them. This index does not allow the field to have duplicate values if the column is unique indexed. CTA It is a DML command.
SQL is one of the most widely used languages. Almost all biggest names in the tech industry such as Uber, Netflix, Airbnb, etc. The reason for the popularity of SQL is that most of the professions require knowledge of database connectivity. Also, in all technical interviews, 30—40 percent of questions will be from SQL. So, this blog lists all the top SQL interview questions.
Correlated subquery : These are queries which select the data from a table referenced in the outer query. Self join is nothing but the table joins with itself. CTA. Hence, such systems are generally used for data mining or maintaining aggregated historical data.
This supports faster execution. Question Answer : Yes SQL language supports the programming language. Keys play a major role in Joins.