What is the correct order of SQL statement?
Six Operations to Order: SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY. By using examples, we will explain the execution order of the six most common operations or pieces in an SQL query.
Which of the following statements about SQL is true?
The correct answer is, option (a): Null values are displayed last in the ascending sequences. And rest all are incorrect answers pertaining to SQL.
Which of the following is correct SQL permits attributes?
the answer is b . SQL permits attribute names to be repeated in the same relation .
Which one of the following is correct a SQL query automatically eliminates duplicates?
Explanation: An SQL does not remove duplicates like relational algebra projection, we have to remove it using distinct. An SQL will work slowly but surely if there are no indexes. An SQL does not permit 2 attributes of same name in a relation.
What comes first in SQL query?
SQL’s from clause selects and joins your tables and is the first executed part of a query. This means that in queries with joins, the join is the first thing to happen.
Which of the following are correct about views in SQL Server?
The view is the virtual tables that are created to restrict access to the data and protect intricate or sensitive data. Virtual tables can improve the query response time by structuring the data in such a way that users find intuitive. Hence, all the above statements are correct for views.
Which one of the following is correct syntax for insert statement?
There are two basic syntax of INSERT INTO statement is as follows: INSERT INTO TABLE_NAME (column1, column2, column3,… columnN)] VALUES (value1, value2, value3,… valueN);
What is the correct syntax to create view?
The syntax for the CREATE VIEW statement in SQL is: CREATE VIEW view_name AS SELECT columns FROM tables [WHERE conditions]; view_name. The name of the SQL VIEW that you wish to create.
Which of the following is true about NoSQL and SQL?
A NoSQL database has dynamic schema for unstructured data. Data is stored in many ways which means it can be document-oriented, column-oriented, graph-based or organized as a KeyValue store.
Key highlights on SQL vs NoSQL:
|These databases have fixed or static or predefined schema||They have dynamic schema|
Which of the following is are correct an SQL query automatically eliminates the duplicates an SQL query will not work if there are no indexes on the relations?
SQL query will not automatically eliminate the duplicates , explicitily we have to use distinct keyword for removing duplicates from result set. If there is no indexes it will create index automatically.
Which of the following is the purpose of SQL?
Explanation: SQL is a query language designed for managing data held in a RDBMS, or for stream processing in a relational database management system (RDBMS).
Which of the following is correct a SQL query will not work if there are no indexes on the relations?
Explanation: The SQL query will work even when there are no indexes on the relations. It is because SQL query could generate index automatically even when there is no indication of indexes. In this context, the index is commonly used for speeding up the presentation of queries in SQL.
Which of the following logical operators are used in SQL?
There are three Logical Operators namely, AND, OR, and NOT. These operators compare two conditions at a time to determine whether a row can be selected for the output.
Which of the following query is correct for using comparison operation operator in SQL?
|Que.||Which of the following query is correct for using comparison operators in SQL?|
|b.||SELECT name, course_name FROM student WHERE age>50 and age <80;|
|c.||SELECT name, course_name FROM student WHERE age>50 and WHERE age<80;|
|d.||None of these|
|Answer:SELECT name, course_name FROM student WHERE age>50 and age <80;|
Which of the following is not constraint in SQL?
Which of the following is not a class of constraint in SQL Server? Explanation: NOT NULL specifies that the column does not accept NULL values.