How to Comment in SQL

What is database Comments?

Comments are the lines that are non-executable in programming languages or SQL. Humans or database administrators can easily understand the comments but compiler not understands these statements. Comments in python language are the way to increase the reliability of the code for a database administrator. Comments will very helpful for future developers, they can easily understand the work using comments on it.

How to Comments in SQL?

SQL provides multiple ways to add comments in your database or tables and want to add constraints in that column. In SQL we can add single line comments and multiple line comments. Single line comments mean you are commenting only one line, but in multiline comments means commenting on or more lines in the same block.

Single-Line Comments in SQL

In SQL we “ — ” operators for single-line comments.

–Select all:

Alternative Solution

But some versions of SQL and almost all DBMS ( Database Management Systems ) provide another operator for commenting a single line, with number sign operator “ = ”.

# Comments goes here :

Multiline Comments in SQL

SQL also provides a way to comment on multiple lines in the same block. The syntax for multiple lines is given below,

Author: TechOnTheNet.com

Author: password

Author: Database name etc.

* /

How to Comment in SQL Shortcuts

Commands for commenting one or multiple lines.

Ctrl + K: Select the one or multiple lines and press this command the selected paragraph will be a comment.

Ctrl + C: it also works same as above Select the one or multiple lines and presses this command.

Commands for uncommenting one or multiple lines.

For Uncommenting again select one or more lines and press these command.

Ctrl + K, and Ctrl + C

After press one of these commands, your text will be uncommented.

Example of Comments in SQL

Below statements contains many singles as well as multiline comments.

SELECT last_name, salary + NVL(commission_pct, 0),

job_id , e.department_id

Select all employees whose compensation is

greater than that of Pataballa.

FROM employees e, departments d

/* The DEPARTMENTS table is used to get the department name. */

WHERE e.department_id = d.department_id

AND salary + NVL ( commission_pct , 0 ) > /* Subquery: */

( SELECT salary + NVL ( commission_pct , 0 )

/* total compensation is salar + commission_pct */

FROM employees

WHERE last_name = ‘ Pataballa ‘ ) ;

SELECT last_name, — select the name

salary + NVL ( commission_pct , 0 ) , — total compensation

job_id , — job

e.department_id — and department

FROM employees e , — of all employees

departments d

WHERE e.department_id = d.department_id

AND salary + NVL ( commission_pct , 0) > — whose compensation

— is greater than

( SELECT salary + NVL ( commission_pct , 0 ) — the compensation

FROM employees

WHERE last_name = ‘ Pataballa ‘ ) — of Pataballa.

;

Can you comment out in SQL?

You can comment out or uncomment a single line of code in an SQL statement, multiple adjacent lines of code, a complete SQL statement, or multiple adjacent SQL statements. The syntax for a comment in a line of SQL code is a double hyphen ( — ) at the beginning of the line.

What does /* mean in SQL?

/* means a start of a multiline comment. For example: /* CREATE PROC A_SAMPLE_PROC BEGIN AS SELECT * FROM A_SAMPLE_TABLE END */ while — means single line comment. Keyboard shortcut for commenting in MS SQL Server Studio is Ctrl + K, Ctrl + C.

How do I comment out code in SQL Server?

To comment out lines of code in SQL Server Management Studio (SSMS) Query Window, select lines of code you want to comment out and hit the keyboard shortcut ‘CTRL+K’ followed by ‘CTRL+C’.

How do I comment out a single line in MySQL?

In MySQL, a comment started with # symbol must be at the end of a line in your SQL statement with a line break after it. This method of commenting can only span a single line within your SQL and must be at the end of the line.

How do I comment in Oracle SQL?

You can include a comment in a statement in two ways:

Begin the comment with a slash and an asterisk (/*). Proceed with the text of the comment. This text can span multiple lines.
Begin the comment with — (two hyphens). Proceed with the text of the comment. This text cannot extend to a new line.

How do you comment in SQL access?

The syntax for creating the comment in SQL using — symbol is the following. Any text between — and the end of the line will be ignored (will not be executed). The comment started with — symbol must be at the end of the line in your SQL statement with the line break after it.

How do you comment in Microsoft Access?

In access 2000 and above there is an edit toolbar and if you select more than one line of code the toolbar will allow you to comment/uncomment the whole block.

How do you comment out code in access?

Comment a selected block of code

Select the lines to comment.
On the Toolbar click or the Code VBA menu select Comment » Comment Lines ( Alt-CMC )

How do you comment in Visual Basic?

To comment keyboard shortcut is Ctrl + K, C and to uncomment keyboard shortcut is Ctrl + K, U .

How do I comment in a macro?

Steps you need to follow to add a comment in a VBA code:

First, click on the line where you want to insert the comment.
After that, type an APOSTROPHE using your keyboard key.
Next, type the comment that you want to add to the code.
In the end, hit enter to move to the new line and the comment will turn green.

How do you comment out text in VBA?

To let Excel VBA know that you want to insert a comment, precede the text with an apostrophe. Note: Excel VBA colors the line green to indicate that it’s a comment. Comments become more useful as program size increases. You can also convert multiple code lines to comments temporarily.

How do you comment a section in VBA?

In order to display this button, you need to add it: View -> Toolbars -> Edit. Now you can see two buttons in the toolbar: Comment block and Uncomment block. Simply highlight your desired line(s) of code and click one of the buttons. This will comment/uncomment entire lines.

How do I comment multiple lines in a macro?

Now you can comment (or uncomment) as many lines as you like with a single click.

Commenting a block of code in VBA

Go to View-Toolbars-Customise.
Select the Command tab.
Select the Edit Category on the left.
Drag the “Comment Block” and “Uncomment Block” icons onto your toolbar.

How do you comment in Excel?

Right-click the cell and then click New Comment. Type your comment. Click the Post button (or press ⌘+Enter). If other people have something to add, they can right-click the cell and choose Reply to Comment.

What do slicers provide you with?

Slicers provide buttons that you can click to filter tables, or PivotTables. In addition to quick filtering, slicers also indicate the current filtering state, which makes it easy to understand what exactly is currently displayed. You can use a slicer to filter data in a table or PivotTable with ease.

What will AutoSum do?

AutoSum is a Microsoft Excel and other spreadsheet program function that adds together a range of cells and displays the total in the cell below the selected range. For example, if you wanted to add the values of cells between A1 and A5, highlight cells A1 through A5 and click the AutoSum button (shown right).

How do you reply to a comment in Excel?

To reply to a comment someone else has left for you, you can either click on the cell and enter a reply immediately into the Reply box or you can right-click the cell where the comment is located and use the Reply box from there.