SYSTIMESTAMP is a special pseudo column that exists in the Oracle database and allows you to return the current database timestamp as part of your SQL query. SYSTIMESTAMP provides much high granularity compared to the SYSDATE function.
- [Instructor] In addition to Oracle's sysdate function,…which allows us to retrieve the current date and time,…as we saw in our previous video,…Oracle also provides a systimestamp function,…which allows us to view the…current timestamp in the database.…Systimestamp provides much higher granularity or precision…when compared to just sysdate.…Let's see it in action.…We'll type select systimestamp from dual.…Running this query will show us the current timestamp…of the Oracle database.…
Running this query again will…provide us with an updated value.…Note the high level of precision or granularity,…of the exact timestamp provided by this function.…Let's compare it to sysdate.…So I'll type comma to char sysdate comma quote…and the formatting string, DD, MM…and a four digit year format, followed by the time format.…
Running a query will show us a comparison…between the value generated by systimestamp…and the value generated by sysdate.…Again, note the increased precision and granularity…of the actual value provided to us.…
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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