3/24/2023 0 Comments Mysql comment![]() From a - sequence to the end of the line. Purpose: To show a comment in SQL Query for multiple lines. MySQL Server supports three comment styles: From a character to the end of the line. In Oracle, you can also create a SQL comment in query that spans multiple lines using this syntax: SELECT e.ename /* Author: This SQL comment in query shows across multiple lines in Oracle - in this example, it shows across 4 lines. * Purpose: To show a comment of multiple lines in SQL Query. In Oracle, you can create a SQL comment that shows multiple lines in your SQL statement. Or: SELECT e.ename - Author: OnlinteItTutor.Com Here is a SQL comments in query that appears at the end of the line: SELECT e.ename /* Author: */ Here is a SQL comment in query that appears in the middle of the line: SELECT /* Author: */ e.ename This text cannot extend to a new line for new commenting. This text can be spanning multiple lines.īegin the comment section with - (two hyphens). You can write a comment in SQL & PLSQL statements in two easy ways:īegin the comment section with a forward slash and an asterisk (/*). ![]() SQL> SELECT 'ABOVE COMMENT WORKS' FROM DUAL In PL/SQL Developer too it should work with COMMAND window. This syntax differs slightly from standard SQL comment syntax, as discussed in Section 1.8.2.4, '- as the Start of a Comment'. It works perfectly in SQL Developer when executed as a script. 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). Update Mostly all GUI based tools are able to execute SQL*Plus commands in their own sqlplus type window. ![]() The symbol " was inserted before "COMMENT" to continue. PLS-00103: Encountered the symbol "COMMENT" when expecting one of the SQL> beginĢ DBMS_OUTPUT.PUT_LINE('comment') REM commentĭBMS_OUTPUT.PUT_LINE('comment') REM comment So, - and /* */ works in PL/SQL block too. An interesting example is a null byte method used to comment out everything after the current query in MS Access databases. The difference between REM and the other two is that, - and /* */ can be used in a PL/SQL block, while REM cannot.Ģ DBMS_OUTPUT.PUT_LINE('comment 1') -comment 1ģ DBMS_OUTPUT.PUT_LINE('comment 2') /* comment 2*/ To comment out some parts of the queries, the attacker may use the standard sequences, typical for a given language, or terminate the queries using their own methods being limited only by their imagination.
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