Learn how to use foreign keys in SQL to create referential integrity between two values in two database tables.
- [Instructor] Check constraints in SQL…allows us to create tables and specify that…the values inserted to one or more of…the columns in the table need to meet…a very specific, user-supplied rule,…so that we can control which values…will be accepted when we insert data,…and which values will be rejected.…So for example, we can create a table…and specify that, for a name column…that exists in this table, all values…inserted need to be uppercase.…
So, lowercase values will be rejected.…Let's see this example in action.…Create table, demo_table_new, this is…the name of the table, and specify two columns,…id number precision four, and name of…the varchar2 data type, precision 50.…So far, so good.…Now we specify a check constraint.…We do that by typing constraint,…followed by the constraint name,…which can be any name you choose,…check_uppercase_name, in my case,…and then specify the constraint type,…check, in our case.…
Check signifies that this constraint…will check incoming values when data is inserted…or updated in the table, and see that…
Note: This training course is appropriate for beginning database developers with no prior experience with SQL or Oracle.
- Using Oracle SQL*Developer, the free development environment
- Selecting data from tables
- Filtering data
- Using functions to manipulate data
- Joining data from tables
- Creating tables
- Updating values
- Truncating data
- Grouping and ordering result sets
- Working with primary keys
- Checking constraints
Skill Level Beginner
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1. Introduction to SQL
2. Preparing the Course Environment
Downloading the course VM2m 16s
3. Using Oracle SQL Developer
4. Basic SELECT Queries
5. String, Number, and Date Functions
6. Joining Table Data
7. Manipulating Data
8. Grouping Data
9. Advanced Topics
Next steps1m 33s
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