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…
Author
Released
1/17/2018Note: 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
Duration
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Introduction
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Welcome1m 37s
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1. Introduction to SQL
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What is SQL?2m 30s
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Database tables2m 21s
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Overview of table data types4m 21s
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SQL query structure4m 38s
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2. Preparing the Course Environment
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Downloading the course VM2m 16s
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3. Using Oracle SQL Developer
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Exploring database objects1m 29s
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Filtering specific objects1m 25s
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Using SQL Developer tabs2m 18s
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Viewing query output1m 18s
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4. Basic SELECT Queries
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Using WHERE to filter dates2m 42s
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Using column aliases2m 18s
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Using ORDER BY3m 29s
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5. String, Number, and Date Functions
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Introduction to functions1m 39s
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Using LENGTH1m 4s
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Using CONCAT4m 48s
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Using LOWER and UPPER2m 44s
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Using INSTR4m 32s
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Using RPAD and LPAD3m 31s
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Using ROUND1m 15s
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Using TRUNC1m 36s
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Using SYSDATE1m 59s
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Using SYSTIMESTAMP1m 37s
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Using MONTHS_BETWEEN3m 2s
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Using ADD_MONTHS1m 17s
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6. Joining Table Data
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Joining data from tables4m 12s
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INNER JOIN1m 17s
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LEFT JOIN2m 55s
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RIGHT JOIN1m 55s
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FULL OUTER JOIN1m 59s
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7. Manipulating Data
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Creating a simple table2m 1s
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COMMIT and ROLLBACK2m 23s
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Introduction to transactions3m 43s
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Deleting rows for a table3m 23s
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Updating values2m 40s
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8. Grouping Data
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Using aggregate functions2m 24s
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Using GROUP BY2m 45s
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Using HAVING3m
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9. Advanced Topics
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Primary keys2m 47s
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NOT NULL constraints1m 36s
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Check constraints3m 2s
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Foreign key constraints6m 4s
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Subqueries4m 39s
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Conclusion
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Next steps1m 33s
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Video: Check constraints