SQL and Excel Interview for FDM Exam Questions With Correct Answers.

SQL and Excel Interview for FDM Exam Questions With Correct Answers. What is a DBMS? - answerA Database Management System (DBMS) is a program that controls creation, maintenance and use of a database. DBMS can be termed as File Manager that manages data in a database rather than saving it in file systems What is RDBMS? - answerRDBMS stands for Relational Database Management System. RDBMS store the data into the collection of tables, which is related by common fields between the columns of the table. It also provides relational operators to manipulate the data stored into the tables. Example: SQL Server. What is SQL? - answerSQL stands for Structured Query Language , and it is used to communicate with the Database. This is a standard language used to perform tasks such as retrieval, updation, insertion and deletion of data from a database. Standard SQL Commands are Select. What is a Database? - answeran organized form of data for easy access, storing, retrieval and managing of data. This is also known as structured form of data which can be accessed in many ways. Example: School Management Database, Bank Management Database. What are tables and Fields? - answerA table is a set of data that are organized in a model with Columns and Rows. Columns can be categorized as vertical, and Rows are horizontal. A table has specified number of column called fields but can have any number of rows which is called record. Example:. EXAM STUDY MATERIALS July 29, 2024 12:59 PM Table: Employee. Field: Emp ID, Emp Name, Date of Birth. Data: 201456, David, 11/15/1960. What is a primary key? - answerA primary key is a combination of fields which uniquely specify a row. This is a special kind of unique key, and it has implicit NOT NULL constraint. It means, Primary key values cannot be NULL. What is a unique key? - answerA Unique key constraint uniquely identified each record in the database. This provides uniqueness for the column or set of columns. A Primary key constraint has automatic unique constraint defined on it. But not, in the case of Unique Key. There can be many unique constraint defined per table, but only one Primary key constraint defined per table. What is a foreign key? - answerA foreign key is one table which can be related to the primary key of another table. Relationship needs to be created between two tables by referencing foreign key with the primary key of another table. What is a join? - answer'join' used to connect two or more tables logically with or without common field(s) What are the types of join and explain each? - answervarious types of join which can be used to retrieve data and it depends on the relationship between tables. Inner Join. Inner join return rows when there is at least one match of rows between the tables. Right Join. Right join return rows which are common between the tables and all rows of Right hand side table. Simply, it returns all the rows from the rig