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7 lut 2015 · As suggested by @simplyharsh, you can also configure individual columns to display set widths, using COLUMN col_name FORMAT Ax (where x is the desired length, in characters) - this is useful if you have one or two extra large columns and you just wish to show a summary of their values in the console screen.
You can change the displayed width of a datatype or DATE, by using the COLUMN command with a format model consisting of the letter A (for alphanumeric) followed by a number representing the width of the column in characters.
You can change the displayed width of a datatype or DATE, by using the COLUMN command with a format model consisting of the letter A (for alphanumeric) followed by a number representing the width of the column in characters.
We use ALTER TABLE MODIFY column command to change columns in existing tables. Like increasing or decreasing the width of a column, change the datatype of a column(conditions apply, we will discuss these later on), adding a constraint to a column (conditional), encrypting or decrypting a column etc.
A NUMBER column's width equals the width of the heading or the width of the FORMAT plus one space for the sign, whichever is greater. If you do not explicitly use COLUMN FORMAT or SET NUMFORMAT, then the column's width will always be at least the value of SET NUMWIDTH. SQL*Plus may round your NUMBER data to fit your format or field width.
This tutorial shows you how to use the Oracle ALTER TABLE MODIFY column statement to change the definition of existing columns in a table.
Use the ALTER TABLE...MODIFY statement to modify an existing column definition. You can modify column data type, default value, column constraint, column expression (for virtual columns) and column encryption.
