File Name: oracle sql interview questions and answers .zip
There are a lot of opportunities from many reputed companies in the world. According to research SQL by Microsoft grew at In the upcoming era, the competition will be more heated than is has been for years. So, You still have the opportunity to move ahead in your career in SQL certification guide.
This course will help you to achieve excellence in this domain. Let's have a look into them. Ans: It is basically a program which is considered when it comes to maintaining, creating, deploying, controlling as well as monitoring the use of a database.
It can also be considered as a file manager which is good enough to be trusted for managing the data kept in a database than a file system. The database approach is really a good one as it is numerous benefits for the organizations. The entire data can easily be managed simply irrespective of its size and complexity. Ans: Basically, a table is a set of different rows and columns and is organized in a model. The manner of columns and rows are vertical and horizontal.
In a table, there are some specific numbers of columns which remains present and is generally known as fields. There is no strict upper limit on the overall number of records which are defined by rows in the table. Ans: An Inner join is the one that is useful for the purpose of returning the rows provided at least two tables are met critically. On the other hand, the outer join is the one that is useful for returning the value of rows and tables that generally include the records that must be same in all the tables.
Ans: It is basically an array or a group of fields that generally specify a row. It is considered as one of the unique keys that always have some defined or specific value.
Generally, the users need not worry about anything when it is enabled as it cannot have a null value. It is capable to identify all the records in a database simply and the users are free to get the best possible outcome with minimum efforts.
This is exactly what that makes sure of uniqueness. Ans: It is basically nothing but the back end testing or data testing. It generally involves keeping an eye on the integrity of the data an organization use. It generally validates some of the very useful tasks such as database, indexes, columns, tables as well as triggers.
IT also make sure that no duplicate data exist in the database which causes a very large number of problems and the best part is the junk records can also be trashed in a very reliable manner. The updating of the record is also a task that can be made easy with the help of this approach.
Ans: These are some important rules in the SQL which are responsible for the restrictions when it comes to deleting, updating or changing the primary data present in the database. Ans: The key which is created on multiple columns in a table is generally considered as the Composite primary key. However, it is not always necessary that all of them have the same meaning.
Ans: It is basically a space that is allotted for storing some records that are present within a table. There are actually different fields and it is not always necessary that all the fields are the same in terms of size and allocation pattern. Ans: You can answer these questions based on the commands you have used in your past if you having a bit of experience in SQL. Else, the following commands are there which are widely adopted and are very useful.
Ans: They are generally preferred when it comes to defining or changing the structure of a specific database in the shortest possible times due to security and other concerns. Some of the commands that can be applied and considered directly for this are as follows. Ans: It is basically a structure in the SQL that is sued for storing any sort of data that is not permanent or need to be stored for a specific time period. Depending on the needs, it is possible to extend the space up to any extend.
Generally, limited space is kept reserved as the temp table. Ans: Commands that are used for the purpose of managing the data present in the database It is possible to create the index on a single column or a group of same.
On the other side, a View is basically nothing but the subset of a table and is used for the purpose of storing the database in a logical manner.
It is actually a virtual table that has rows as well as the columns which are similar to that of a real table. The same is considered when it comes to restricting the access of a database. Ans: No, the same is not possible. Q 18 What do you mean by the term SQL? Ans: It stands for Structured Query Language and is a powerful language to communicate the database and monitor the concerned tasks easily and reliably. It comes with so many dedicated features in it that are good enough to make a database completely useful and reliable to consider.
There are many commands that can be considered and help to save a lot of time when it comes to getting the best out of a database. Ans: It is basically a SQL query and is generally regarded as the subset of the select statement and the process of those tasks that generally make sure of filtering the conditions related to the main query.
Q 20 In a query, is it possible for the users to avoid the duplicate records? How this can be done? Ans: Yes, the same is possible and there are many methods that can help users to get the favorable fortune in this matter. All the repeated values or the ones which are duplicate get deleted automatically. Q 21 What is the significance of the default constraint in SQL? Ans: It is used when it comes to including a default value in a column in case there is no new value provided at the time a record is inserted.
Ans: There are certain things that largely matters. The first and the foremost is nothing but the size of the database in terms of its storing capacity. Of course, for a bigger database, the needs are complex and so does its management. Thus, the first thing that can help to keep up the pace in this matter is a powerful query language or a controlling procedure. Next thing is the security of the database. In addition to this, the experience of the experts handling the important operations can also largely impact the database.
Moreover, there are conditions on the operation of the same that also largely matter. Q 23 How can you put separate the Rename and the Alias? Ans: Join is basically a query that is useful for the purpose of retrieving the columns and the rows. It is useful when users have to handle a very large number of tables at the same time.
It is totally different from that of a zero value and must not be put equal or confused with the same. These fields are left blank during the creation of the records. Ans: It is basically an approach with one of its primary aims is to simply impose a strict upper limit on the redundancy of the data.
The users are free to go ahead with many of the normalizations forms present in the SQL and a few of them are First, second, third and Boyce Normal Form. Q 27 What do you know about the stored procedure? Ans: It is nothing but an array of some important SQL statements that are stored in the database and are responsible for performing a specific task. Q 28 Name the SQL procedure which makes sure an immediate action in response to an event?
Ans: The same is Trigger. Q 29 In the Boolean Data Field, what are the possible values that users can simply store? Ans: There are three important types of Indexes and they are. Ans: These are several good things about them. The very first thing is they consume almost no space which makes them good enough to be considered in every situation. At the same time, the users are able to consider views for simply retrieving the outcomes that belong to queries which are complicated in nature.
The same may need to be executed frequently. It is possible to consider this when it comes to restricting access to the database. Used for Database communication.
Its a standard language that can be used to perform the tasks like data retrieval, data update, insert or delete data from a database. MySQL is a computer application. It enables access to several database application and management system. SQL is a more natural and standard language that is used with different applications alike. But, however no organization actually employs this standard language, rather every software firm follows its own kind of SQL version.
End-user cannot interact directly with the database server. Ans: 1. Give a brief description of their purposes. Ans: DDL Commands are used to define the structure of the table. Creating Table : Syntax -. Syntax :. Method1: If we want to drop a single column at a time without using parentheses then we are using the following syntax. Method2 : If we want to drop single or multiple columns at a time with using paranthesis then we are using the following syntax. DROP It is used to remove database objects from the database.
Ans: DML Commands are used to manipulate data within a table. Method3 :- Skipping columns Syntax :. Note : In all databases, we can also use the update statement for inserting data into a particular shell. Ans: It is a mechanism of getting secure data from the database.
What is Oracle and what are its different editions? Answer: Oracle is one of the popular database provided by Oracle Corporation, which works on relational management concepts and hence it is referred to as Oracle RDBMS as well. It is widely used for online transaction processing, data warehousing, and enterprise grid computing. What is a Data Dictionary and how can it be created? Answer : Whenever a new database is created, a database-specific data dictionary gets created by the system. This dictionary maintains all the metadata related to the database and owned by the SYS user.
Now the client wants to insert a record after the identity value 7 with its identity value starting from Write a single query to calculate the sum of all positive values of x and he sum of all negative values of x. Although there are 4 customers not referred by Jane Smith including Jane Smith herself , the query will only return one: Pat Richards. This will return the same faulty set as the original. Those particular operators will always evaluate to true or false. Given a table TBL with a field Nmbr that has rows with the following values:.
In this article, we have covered 90+ most popular SQL interview questions with answers. These are useful questions for freshers and.
SQL programming skills are highly desirable and required in the market, as there is a massive use of Database Management Systems DBMS in almost every software application. In order to get a job, candidates need to crack the interview in which they are asked various SQL interview questions. Following is a curated list of SQL interview questions and answers, which are likely to be asked during the SQL interview. Candidates are likely to be asked basic SQL interview questions to advance level SQL questions depending on their experience and various other factors. The below list covers all the SQL interview questions for freshers as well as SQL interview questions for experienced level candidates and some SQL query interview questions.
PL Procedural language is an extension to SQL Structured Query Language where a developer can write complex database interactions using procedures, control structures like branching and iteration, modules and functions.Reply
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Following is a curated list of SQL interview questions and answers, which are likely to SQL Interview Questions PDF file: Download here AUTO INCREMENT keyword can be used in Oracle and IDENTITY keyword can be.Reply
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