When using the TO_CHAR() function to format a number in Oracle Database, you can use the PR format element to return negative values inside angle brackets (<>).
Object-Relational
3 Ways to Format a Number as a Percentage in PostgreSQL
We have several options if we want to display numbers with a percentage sign in PostgreSQL.
We can use the TO_CHAR() function to format the number along with the percentage sign. Or we can simply concatenate the number with the percentage sign, either with the CONCAT() function or with the concatenation operator.
Format a Number as a Percentage in Oracle
Even though Oracle Database has a TO_CHAR(number) function that allows us to format numbers, it doesn’t provide a format element for the percentage sign.
Therefore, if we want to format a number as a percentage in Oracle Database, we need to concatenate the percentage sign and the number.
How to Export Query Results to a .txt File when using SQLcl (Oracle)
When querying Oracle Database, you can use the SPOOL command to export your query results to a text file when using SQLcl.
LISTAGG() Function in Oracle
In Oracle, the LISTAGG() function enables us to combine data from multiple rows in to a single row.
We have the option of specifying a separator (such as a comma). We can also order the results produced by the LISTAGG() function, and more.
STRING_AGG() Function in PostgreSQL
In PostgreSQL, we can use the STRING_AGG() function to return columns from a query as a delimited list.
How POSITION() Works in PostgreSQL
PostgreSQL has a POSITION() function that returns the first starting index of a specified substring within a string.
If the substring doesn’t exist in the string, then zero is returned.