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Jesse Roy SQL Interview Questions Englisch 37 Karten

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  1. 1What is a DBMS?Program that controls creation, maint, and use of a database
  2. 2What is RDMBS?Relation Database Management System - stores data in collection of tables that are related by common fields among them
  3. 3What is SQL?Structured Query Language - communicates with database and performs tasks that create, read, update, and delete
  4. 4What is a database?Organized for of data for easy access, storing, retrieval and management of data
  5. 5What are tables and fields?Table is a set of data organized in columns and rows. Each column is a field
  6. 6What is a primary key?combination of fields that uniquely specifies a row. NOT NULL constraint?
  7. 7What is a unique key?Provides uniqueness for column or set of columns. There can be many unique keys in a table but only one primary key
  8. 8what is a foreign key?can be related to the primary key of another table when relationship is needed between two or more tables
  9. 9What is a join?query data from more than one table
  10. 10What is an inner join?returns rows when there is at least one match of rows between the tables
  11. 11What is a right join?Right join will always return all rows of right table and any matches from the left
  12. 12what is a left join?Left join returns rows common between the tables and all rows of left hand side table
  13. 13what is a full join?Returns rows when there are matching rows in any one of the tables
  14. 14What is normalization?process of minimizing redundancy and dependencies in a database. Try to add, delete, or modify any field that can be made in a single table
  15. 15What is a view?a virtual table that has a subset of data. Takes less space to store
  16. 16What is an index in a database?Index is used for performance tuning allowing faster retrieval of records from table. Creates entry for each value
  17. 17What is a database cursor?a control that traverses over the rows or records in the table. Used for retrieval, addition, and removal of database records
  18. 18What are the relationships in a database?Connections between tables
    One to One
    One to Many
    Many to One
  19. 19What is a query?code written to get information back from the database, essential a question
  20. 20What is a subquery?a query within a query. Subquery is always executed first
  21. 21What is a stored procedure?a function that consists of many SQL statements to access the database.
  22. 22What's the difference between DELETE and TRUNCATEdelete removes all rows and can use where to set parameters. Truncate removes all rows from table and cannot be rolled back
  23. 23What is a contraint?Contraint specifies the limit on the data type of a table
    NOT NULL
    CHECK
    DEFAULT
    UNIQUE
    PRIMARY KEY
    FOREIGN KEY
  24. 24What is data integrity?Defines the accuracy and consistency of data stored in a database. Define business rules on the data when it's entered
  25. 25What is user defined functions?Functions written to use logic wherever required.
  26. 26What are all types of user defined functions?Scalar - returns unit
    Inline table value - table
    Multistatement valued - table
  27. 27Advantages and disadvantages of Stored ProceduresCreate once and store to be used everywhere.
    Can only be executed in the Database and utilizes more memory in the database server
  28. 28What is Online Transaction ProcessingServing real time transactions
  29. 29what is a SQL clause?defined to limit the result by providing condition to the query
  30. 30What is a UNION in SQL?Combine rows from both queries
  31. 31What is an INTERSECT in SQL?combine only rows in common between queries
  32. 32What is EXCEPT in SQL?Keep rows from left query that aren't include in the second query
  33. 33What is the difference between SQL TRUNCATE and DROP?Truncate removes all rows, drop removes table from the database
  34. 34How to create empty table from exisiting table?Select * INTO FROM xxxx WHERE xxxx
  35. 35How to retrieve common records from two tables?SELECT xxxx FROM xxxx INTERSECT xxxx FROM xxxxx
  36. 36How to select unique records from a table?SELECT DISTINCT xxx, xxx,xxx FROM xxxx
  37. 37What is the commond to get first 5 characters of string in SQLSELECT SUBSTRING(field, startingIndex, endingIndec) as newFieldName from Table

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SQL Interview Questions Karteikarten am Ohne Titel, erstellt von Jesse Roy am 02/08/2018.
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