What Is REM command in SQL?
REM, or short for REMARK, is used in SQL*Plus to indicate the beginning of a comment in a SQL script.
What Is REM command in Oracle?
REM[ARK] Begins a comment in a script. SQL*Plus does not interpret the comment as a command. Usage. The REMARK command must appear at the beginning of a line, and the comment ends at the end of the line.
What is list aggregate function in SQL?
LISTAGG function in DBMS is used to aggregate strings from data in columns in a database table. It makes it very easy to concatenate strings. It is similar to concatenation but uses grouping. The speciality about this function is that, it also allows to order the elements in the concatenated list.
What Is REM statement?
Use the REM statement to insert a comment in a BASIC program. Comments explain or document various parts of a program. They are part of the source code only and are nonexecutable. They do not affect the size of the object code. A comment must be a separate BASIC statement, and can appear anywhere in a program.
What does echo off do?
The ECHO-ON and ECHO-OFF commands are used to enable and disable the echoing, or displaying on the screen, of characters entered at the keyboard. If echoing is disabled, input will not appear on the terminal screen as it is typed. By default, echoing is enabled.
What is set define off in Oracle?
If you set as SET DEFINE ON,Then it will ask the variable value . If you set as SET DEFINE OFF,Then it will not ask the variable value . Example, if you set – SET DEFINE ON. select &a from dual – (it will show the popup window)
How do I comment in a .SQL file?
- Begin the comment with a slash and an asterisk (/*). Proceed with the text of the comment. This text can span multiple lines. End the comment with an asterisk and a slash (*/).
- Begin the comment with — (two hyphens). Proceed with the text of the comment. This text cannot extend to a new line.
Why do we use REM statement?
Use the REM statement to insert a comment in a BASIC program. Comments explain or document various parts of a program. They are part of the source code only and are nonexecutable. They do not affect the size of the object code.
Why do we need echo command?
echo command in linux is used to display line of text/string that are passed as an argument . This is a built in command that is mostly used in shell scripts and batch files to output status text to the screen or a file.
What is set verify off?
SET VER[IFY] Is the command, which may be abbreviated SET VER. OFF. Turns off verification.
How do you comment multiple lines in SQL?
Multi-line comments start with /* and end with */ . Any text between /* and */ will be ignored.