How do I comment in a MySQL query?

How do I add comments to a table in MySQL?

The comments can be added to the MySQL columns while creating a table by adding the COMMENT keyword after the column definition, as shown above for column emp_name. The table is created successfully with comments. Confirm the same in column information using MySQL workbench.

How do I comment in MySQL workbench?

Start up MySQL Workbench and try out your fully working shortcut! Don’t forget you can also manually do this by going to the menu Edit -> Format -> Un/Comment Selection . You can also use the division symbol (forward slash) near the full size keypad if you have one.

Which is the comment symbol in MySQL Mcq?

In MySQL Server, we can write the comments in mainly three ways that are given below: Using # symbol. Using – symbol. Using /* and */ symbol.

Are there comments in SQL?

In SQL, you can comment your code just like any other language. Comments can appear on a single line or span across multiple lines.

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How do I comment in SQL code?

Comments Within SQL Statements

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

How do I add a column description in MySQL?

The syntax to add a column in a table in MySQL (using the ALTER TABLE statement) is: ALTER TABLE table_name ADD new_column_name column_definition [ FIRST | AFTER column_name ]; table_name.

What is good about MySQL?

It is open source, reliable, compatible with all major hosting providers, cost-effective, and easy to manage. Many organizations are leveraging the data security and strong transactional support offered by MySQL to secure online transactions and enhance customer interactions.

How do I comment in Sqlyog?

Advanced Editing Features

  1. Make Selection Uppercase: To change selected text to uppercase (or press Ctrl+Shift+U)
  2. Make Selection Lowercase: To change selected text to lowercase (or press Ctrl+Shift+L)
  3. Comment Selection: To comment the selected text (or press Ctrl+Shift+C)

What is group by in MySQL?

The MYSQL GROUP BY Clause is used to collect data from multiple records and group the result by one or more column. It is generally used in a SELECT statement. You can also use some aggregate functions like COUNT, SUM, MIN, MAX, AVG etc. on the grouped column.

What OS does MySQL run on?

Platform Independence – MySQL runs on over 20 platforms including Linux, Solaris, AIX, HP-UX, Windows, and Mac OS X giving organizations complete flexibility in delivering a solution on the platform of their choice.

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How do I comment in spark SQL?

For single line comment we should use — and for multiline /* comments */ . Actually comment is working in your case, problem is – spark ignores those comments after that it looks for sql commands but you didn’t specify any. Below code will throw error.

How do I comment in Oracle SQL?

Comments Within SQL Statements

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

How do I comment in a stored procedure?

To create line comments you just use two dashes “–” in front of the code you want to comment. You can comment out one or multiple lines with this technique. In this example the entire line is commented out.

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.