An ID column holds a unique value for each row in a table. This is commonly used to provide relationships between tables.
- An ID column is a column that holds … a unique value for each row in a table. … Typically ID columns are automatically populated. … The method for creating an ID column … is not standardized. … How you create an ID column … is different for every database system. … What I'm showing you here is how this works … in SQLite, the database system we are using here. … I'm showing you this, just so you have … an idea of how this works, … but know that the specific syntax … will be different on different systems. … So here we are using the test database again, … and we're creating a table and dropping … the table if exists, of course, … and then inserting some rows into it. … Let's take a look at this line here, … now this is part of the create table statement. … The create table statement is all of that, … including everything in between the parenthesis. … Between the parenthesis, we have … the column definitions for each column. … And the first column is named ID … And it says integer primary key. …
This course was created by Bill Weinman. We are pleased to offer this training in our library.
- How databases are organized
- Selecting rows and columns
- Creating new tables
- Inserting and updating data
- Sorting and filtering
- Accessing related tables with JOIN
- Working with strings
- Understanding numeric types
- Using aggregate functions and transactions
- Automating data with triggers
- Creating views
- Using CRUD functions
Skill Level Beginner
2. SQL Overview
3. Fundamental Concepts
7. Dates and Times
Dates and times2m 6s
11. Views and Subselects
12. A Simple CRUD Application
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