Questions

What is column format in SQL?

COLUMN column_name FORMAT model. If you specify a width shorter than the column heading, SQL*Plus truncates the heading. If you specify a width for a LONG column, SQL*Plus uses the LONGCHUNKSIZE or the specified width, whichever is smaller, as the column width. See the COLUMN command. for more details.

What is the use of (+) in Oracle?

In Oracle, (+) denotes the “optional” table in the JOIN.

How do I change the format of a column in SQL?

To change the data type of a column in a table, use the following syntax:

  1. SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype;
  2. My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype;
  3. Oracle 10G and later: ALTER TABLE table_name.

What is Trimspool in Sqlplus?

The TRIMSPOOL setting controls whether SQL*Plus writes trailing spaces when spooling data to a file. The default setting is OFF, which causes SQL*Plus to write each line to the spool file in its entirety, trailing spaces and all.

How do I create a header in SQL?

SQL Server Management Studio (SSMS) – how to save results with headers

  1. Go to Tools > Options.
  2. Navigate to Query Results > SQL Server > Results to Grid, then check “Include column headers when copying or saving the results” option:
  3. Click OK to save changes, close and restart SSMS to apply changes.

How do you modify a column in SQL?

How do I use the column format command in SQL*Plus?

Normally, SQL*Plus commands, including COLUMN FORMAT, are only effective for the current session of SQL*Plus. To have the SQL*Plus COLUMN FORMAT command used in recurring sessions, it is possible to include COLUMN FORMAT, among other SQL*Plus commands, in a SQL script file to be executed using the SQL*Plus START command.

Does SQL*Plus allow multi-line strings?

SQL*Plus does allow multi-line strings by default. It is only blank lines that cause problems. You can also use not-well-known feature of Oracle’s SQL: Perl style quoted strings. A blank line in a SQL statement or script tells SQL*Plus that you have finished entering the command, but do not want to run it yet.

What is the default size of a long column in SQL*Plus?

A LONG, CLOB, NCLOB or XMLType column’s width defaults to the value of SET LONGCHUNKSIZE or SET LONG, whichever one is smaller. SQL*Plus truncates or wraps XMLType columns after 2000 bytes.

How many columns can I enter in SQL*Plus?

You can enter any number of COLUMN commands for one or more columns. All column attributes set for each column remain in effect for the remainder of the session, until you turn the column OFF, or until you use the CLEAR COLUMN command. When you enter multiple COLUMN commands for the same column, SQL*Plus applies their clauses collectively.