Use the COMMENT statement to add a comment about a table, view, materialized view, or column into the data dictionary. To drop a comment from the database, set it to the empty string ‘ ‘.
How do you comment on views?
Add comments
- In the toolbar above a view, click Comments.
- In the Comments pane at right, enter your remarks.
- If you’d like to notify others about the comment, include an @mention.
- If you’ve filtered the view, click the snapshot icon to share an interactive image that highlights the data you’re describing.
- Click Post.
How do we represent comments in Oracle?
Comments
- Begin the comment with a slash and an asterisk (/*). Proceed with the text of the comment. This text can span multiple lines. End the comment with an asterisk and a slash (*/).
- Begin the comment with — (two hyphens). Proceed with the text of the comment. This text cannot extend to a new line.
What is comment on column?
Adds, revises, or removes a projection column comment. You can only add comments to projection columns, not to table columns. Each object can have one comment. Comments are stored in the system table COMMENTS .
How do I view comments in SQL?
Use the SQL command SHOW FULL COLUMNS as described in the MySQL manual. Its output contains the comments.
How do I add a column to a view in Oracle?
The only options for altering a view are to add/drop/modify constraints or to RECOMPILE the view. If you want to add columns then just run the CREATE OR REPLACE VIEW statement again with a different select.
How do I add a comment to a field in tableau?
It is really easy to add a comment to a calculated field in Tableau. Simply put to forward slashes (//) in front of the text or code you want to be a comment. Tableau will render this piece ‘light-gray’, and the text or code will be ignored in the calculation.
Is the single line comments used in PL SQL?
PL/SQL supports two comment styles: single-line and multi-line. Single-line comments begin with a double hyphen ( – – ) anywhere on a line and extend to the end of the line. Multi-line comments begin with a slash-asterisk ( /* ), end with an asterisk-slash ( */ ), and can span multiple lines.
What are SQL comments?
Comments are used to explain sections of SQL statements, or to prevent execution of SQL statements. Note: The examples in this chapter will not work in Firefox and Microsoft Edge! Comments are not supported in Microsoft Access databases. Firefox and Microsoft Edge are using Microsoft Access database in our examples.
How do I comment multiple lines in Oracle SQL Developer?
6 Answers. In SQL Developer, I highlight all lines of PL/SQL that I want commented and use Ctrl + / . Obviously, you would like a way to comment and uncomment multiple lines quickly. This will put — in front of each line you have highlighted.
What is the shortcut for comment in Oracle SQL?
Hi, In SQL Developer you can comment a line or a block using “Source -> Toggle Line Comments” (Ctrl-Slash), but it would be nice to have a button that allows you to do it not only for line or block, but also for a part of a line.
How do I add a new column to a materialized view?
You can’t add columns to an MV. You need to drop and recreate it. Or create a new one alongside and switch to that. You will lose any changes to T between you “dropping” the MV and re-creating it.
