Comments

This document describes the comment syntax supported by MatrixOne.

MatrixOne supports three comment styles:

• Use # character to comment a line.

mysql> select 100-99;   # This comment continues to the end of line
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.01 sec)

• Use -- to comment a line. 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).

mysql> select 100-99;   -- This comment continues to the end of line
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.01 sec)

• From a /* sequence to the following */ sequence, as in the C programming language. This syntax enables a comment to extend over multiple lines because the beginning and closing sequences need not be on the same line.

mysql> select 100 /* this is an in-line comment */ -99;
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.01 sec)

Or:

mysql> select 100
/*
this is an in-line comment
*/
-99;
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.01 sec)

MySQL-compatible comment syntax

The same as MySQL, MatrixOne supports a variant of C comment style:

mysql> select 100 /*! Specific code */ -99;
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.02 sec)

Or:

mysql> select 100 /*!50110 Specific code */ -99;
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.02 sec)

MatrixOne specific comment syntax

MatrixOne supports a variant of C comment style:

mysql> select 100-99;   // This comment continues to the end of line
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+
1 row in set (0.03 sec)

Or:

mysql> // This comment continues to the line
    -> select 100-99;
+----------+
| 100 - 99 |
+----------+
|        1 |
+----------+

Constraints

MatrixOne does not support nested comments.