Each column in a database table is created to support storing of a specific type of data, be it numbers, characters, dates, and so on. In this video, learn about the role of data types in Oracle and review some of the most popular ones.
- [Instructor] Another important concept…we need to understand before we can start practicing…demos of the SQL language is the concept of Datatypes.…Every database table is made out of one or more columns,…as we saw in our previous video.…When we create a database table in Oracle,…in addition to specifying the column names,…we also have to assign a Datatype for each column.…So for example we can assign…the Number Datatype to the ID column…and the VARCHAR2 datatype to the Name column.…
By the way, in Oracle, VARCHAR2,…which is short for Variable Character 2,…is used to store strings in the database.…And the Hiredate column could be of the Date Datatype.…Many different Datatypes exist in the Oracle database…and we have to specify the Datatype for each column…during table creation.…We'll see examples of this later in our course.…Now why is this important?…Because specifying the Datatype for a column…can help us insure integrity of our data.…
For example, if we specify that the ID column…in the Employees Table is of a Number Datatype,…
Author
David Yahalom
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
Views
-
Introduction
-
Welcome1m 37s
-
-
1. Introduction to SQL
-
What is SQL?2m 30s
-
Database tables2m 21s
-
Overview of table data types4m 21s
-
SQL query structure4m 38s
-
-
2. Preparing the Course Environment
-
Downloading the course VM2m 16s
-
-
3. Using Oracle SQL Developer
-
Exploring database objects1m 29s
-
Filtering specific objects1m 25s
-
Using SQL Developer tabs2m 18s
-
Viewing query output1m 18s
-
4. Basic SELECT Queries
-
Using WHERE to filter dates2m 42s
-
Using column aliases2m 18s
-
Using ORDER BY3m 29s
-
5. String, Number, and Date Functions
-
Introduction to functions1m 39s
-
Using LENGTH1m 4s
-
Using CONCAT4m 48s
-
Using LOWER and UPPER2m 44s
-
Using INSTR4m 32s
-
Using RPAD and LPAD3m 31s
-
Using ROUND1m 15s
-
Using TRUNC1m 36s
-
Using SYSDATE1m 59s
-
Using SYSTIMESTAMP1m 37s
-
Using MONTHS_BETWEEN3m 2s
-
Using ADD_MONTHS1m 17s
-
-
6. Joining Table Data
-
Joining data from tables4m 12s
-
INNER JOIN1m 17s
-
LEFT JOIN2m 55s
-
RIGHT JOIN1m 55s
-
FULL OUTER JOIN1m 59s
-
7. Manipulating Data
-
Creating a simple table2m 1s
-
COMMIT and ROLLBACK2m 23s
-
Introduction to transactions3m 43s
-
Deleting rows for a table3m 23s
-
Updating values2m 40s
-
8. Grouping Data
-
Using aggregate functions2m 24s
-
Using GROUP BY2m 45s
-
Using HAVING3m
-
9. Advanced Topics
-
Primary keys2m 47s
-
NOT NULL constraints1m 36s
-
Check constraints3m 2s
-
Foreign key constraints6m 4s
-
Subqueries4m 39s
-
-
Conclusion
-
Next steps1m 33s
-
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.
Share this video
Embed this video
Video: Overview of table data types