Learn how to use the DESC and DESCRIBE commands in SQL; view the structure of your database tables, including columns names and data types.
- [Instructor] So what happens when you want to run…a SQL query on a database table,…but you are uncertain about the database table structure?…In order to write your SQL query,…you first have to know which columns exist in your table.…What are their data types?…Are there character columns, string columns…or numeric columns, or maybe date columns?…Luckily for us, we can view the structure…of the table directly,…both using a SQL command,…and also using Oracle SQL Developer.…
The simplest way, using the Oracle SQL Developer UI,…for you to see the structure of a table…is to expand the table's folder…under the left-hand connections pane…directly under your database connection.…Here you will see a list of all tables…that exist in the current schema.…Highlighting each one those tables,…such as the employees table,…will show you a description of all of the columns…that exist in this table, as well as their data types.…
So for example, we can see that the employees table…has an employee ID column, a first name column,…a last name column, and so on.…
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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