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,…
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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