The type of value resulting from multiple values of different types may depend on the rules used by your system.
- [Instructor] Most database systems allow expressions … on values of different types. … The type of the resulting value will depend on the rules … the system uses for converting the values used … in the expression. … In some cases, you may need to know the type of the result … and for this purpose we have the type of function. … The type of function is used to find the type … of an expression. … For example, in this first expression we're adding … the numbers one plus one. … Now, a single number as in one like this … without any decimal point is typically an integer … in most SQL systems. … So if I add these two integers together … I'm going to execute this expression. … You see the result is integer. … So I know that this type of this expression is an integer. … Yet in the second expression I have a decimal point. … And so that second number, even if it's 1.0, … that second number is a real number, floating point number. … The first one is an integer. … And so when I add them together the result is real. …
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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