Join Bill Weinman for an in-depth discussion in this video Finding the type of a value, part of SQL Essential Training.
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…Most database systems allow expressions on values of different types.…When they do the type of the result will depend on the…rules the system uses for converting the values used in the expression.…In some cases, you may need to know that type of the result.…For this lesson, we're going to use the in memory database.…And I'm going to start by adding an expression.…So, this expression simply adds two numbers together and gives you the result.…In this case both of the numbers in the expression are integer values.…
If I instead make one of these a real number by putting a .0 after it.…It still has the same value, but now it's…represented as a real number, instead of an integer.…And when we get the result, you'll notice that the result now has…a .0 at the end, which indicates that this is also a real number.…And if I use the TYPEOF function, And we'll go back to just the integers here.…We'll see that the type of this expression is an integer.…And it says integer there.…
The type of function is specific to SQL lite, but most database…
- Understanding SQL terminology and syntax
- Creating new tables and records
- Inserting and updating data
- Writing basic SQL queries
- Sorting and filtering
- Accessing related tables with JOIN
- Working with strings
- Finding the numeric type of a value
- Using aggregate functions and transactions
- Updating a table with triggers
- Creating views
Skill Level Beginner
1. SQL Quick Start
Understanding joins2m 23s
Dates and times1m 59s
10. Subselects and Views
11. A Simple CRUD Application
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