Syntax Using /* and */ symbols In MySQL, a comment that starts with /* symbol and ends with */ and can be anywhere in your SQL statement. This method of commenting can span several lines within your SQL.
Which is the comment symbol in MySQL?
In MySQL, the — (double-dash) comment style requires the second dash to be followed by at least one whitespace or control character (such as a space, tab, newline, and so on). This syntax differs slightly from standard SQL comment syntax, as discussed in Section 1.7. 2.4, “’–‘ as the Start of a Comment”.
What is /* in MySQL?
This is a type of comment. The /* is the beginning of a comment and */ is the end of comment. MySQL will ignore the above comment.
Which is the comment symbol in MySQL Mcq?
Using /* and */ symbol.
Which is the comment symbol in MySQL Mcq?
Using /* and */ symbol.
What is the comment tag in SQL?
A comment can appear between any keywords, parameters, or punctuation marks in a statement. 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.
Which symbol is used for comments in?
Single-line comments start with two forward slashes ( // ).
What does * indicate in SQL?
The second part of a SQL query is the name of the column you want to retrieve for each record you are getting. You can obviously retrieve multiple columns for each record, and (only if you want to retrieve all the columns) you can replace the list of them with * , which means “all columns”.
What are the symbols used to declare multiple line comments * /* /* */?
Multi-line comments start with /* and end with */ . Any text between /* and */ will be ignored by JavaScript.
What is MySQL Mcq?
Our 1000+ MySQL MCQs (Multiple Choice Questions and Answers) focuses on all chapters of MySQL covering 100+ topics. You should practice these MCQs for 1 hour daily for 2-3 months.
Which is not a valid comment style in MySQL Mcq?
C option /*COMMENT is not a valid comment Line.
Can you have comments 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.
How do 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.
Which is the comment symbol in MySQL?
In MySQL, the — (double-dash) comment style requires the second dash to be followed by at least one whitespace or control character (such as a space, tab, newline, and so on). This syntax differs slightly from standard SQL comment syntax, as discussed in Section 1.7. 2.4, “’–‘ as the Start of a Comment”.
What are the types of SQL comments?
There are two types of SQL comments: simple comments. Simple comments are introduced by two consecutive hyphens (–) and end with the end of line. bracketed comments.
How do I comment in SQL Studio?
The keyboard shortcut to comment text is CTRL + K, CTRL + C. The keyboard shortcut to uncomment text is CTRL + K, CTRL + U. Select Execute to run the uncommented portion of the text.
What are comments in C?
Comments can be used to explain code, and to make it more readable. It can also be used to prevent execution when testing alternative code. Comments can be singled-lined or multi-lined.
Which symbol is comment in Python?
Comments in Python are identified with a hash symbol, #, and extend to the end of the line. Hash characters in a string are not considered comments, however. There are three ways to write a comment – as a separate line, beside the corresponding statement of code, or as a multi-line comment block.
Which symbol is used for comments in C++?
A C++ comment is written in one of the following ways: The /* (slash, asterisk) characters, followed by any sequence of characters (including new lines), followed by the */ characters. This syntax is the same as ANSI C. The // (two slashes) characters, followed by any sequence of characters.
Is * a wildcard in SQL?
To broaden the selections of a structured query language (SQL-SELECT) statement, two wildcard characters, the percent sign (%) and the underscore (_), can be used. The percent sign is analogous to the asterisk (*) wildcard character used with MS-DOS.
What is the meaning of the asterisk (*) in the SQL command?
The asterisk or star symbol ( * ) means all columns. The semi-colon ( ; ) terminates the statement like a period in sentence or question mark in a question.
Should you use * in SQL?
That’s all about why you should not use SELECT * in the SQL query anymore. It’s always better to use the explicit column list in the SELECT query than a * wildcard. It not only improves the performance but also makes your code more explicit.
