Join Bill Weinman for an in-depth discussion in this video Conditional expressions with CASE, part of SQL Essential Training.
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- Exercise Files
…SQL provides a form of conditional expression.…It's a little cumbersome, but here's how it works.…I'm going to use the test.db database.…I'm going to copy and paste from the exercise files for…chapter 2 here, under CASE this is around line 157.…I'm going to grab these 3 lines that create a table and insert a row.…The table is called bull test, going to paste this into our box here and press go.…Boolean's in SQL lite are integers with a value…of 0 for false and anything else for true.…
So Boolean's are often handled like this with an integer column.…And so I've inserted one row and there's a one or a true in column A.…And a zero or a false in column B.…And so we'll leave that select there.…And I'm going to create another select after it.…With a case statement in it.…And it's probably easiest to just copy and paste this as well.…And this case expression, it's not actually a…statement, it's an expression, is a conditional expression.…So, how this works, it's introduced with case and it ends with end.…
And the when clause tests for true or false.…
- 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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