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SQL Server FAQs - Understanding INSERT, UPDATE and DELETE Statements

By: FYIcenter.com

A collection of 18 FAQs on SQL INSERT, UPDATE and DELETE statements. Clear answers are provided with tutorial exercises on inserting, updating and deleting single and multiple rows; using column default values; using subqueries to INSERT and UPDATE statements. Topics included in this FAQ are:

  1. What Are DML (Data Manipulation Language) Statements?
  2. How To Create a Testing Table with Test Data?
  3. How To Insert a New Row into a Table with "INSERT INTO" Statements?
  4. How To Use Column Default Values in INSERT Statements?
  5. How to provide column names in INSERT Statements?
  6. What Happens If You Insert a Duplicate Key for the Primary Key Column?
  7. How To Insert Multiple Rows with One INSERT Statement?
  8. How To Update Values in a Table with UPDATE Statements?
  9. How To Update Multiple Rows with One UPDATE Statement?
  10. How to use old values to define new values in UPDATE statements?
  11. Is the Order of Columns in the SET Clause Important?
  12. How To Use Values from Other Tables in UPDATE Statements?
  13. What Happens If the UPDATE Subquery Returns No Rows?
  14. What Happens If the UPDATE Subquery Returns Multiple Rows?
  15. How To Delete an Existing Row with DELETE Statements?
  16. How To Delete Multiple Rows with One DELETE Statement?
  17. How To Delete All Rows with DELETE Statements?
  18. How To Delete All Rows with TRUNCATE TABLE Statement?

Please note that all answers and tutorials are based on MS SQL Server 2005. To follow tutorials in this collection, you should connect to SQL server as a regular user who has enough permissions to create table and insert date in "FyiCenterData". It is assumed that you are using the temporary database, FyiCenterData, created in previous tutorial collections. Some sample scripts requires database tables created by other samples in the beginning of the collection.

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