There are several ways to format a number as a percentage in SQL, depending on the DBMS being used.
Here are examples of adding a percent sign to a number in some of the most popular DBMSs.
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How to Change the Locale When Formatting Numbers in PostgreSQL
If you’re formatting a number in PostgreSQL, and you want to change the locale so that the correct group and decimal separators are used, here’s how you can do that.
Oracle DROP TABLE IF EXISTS Alternatives
The very useful DROP TABLE IF EXISTS syntax was finally introduced in Oracle Database – Oracle Database 23c to be precise. This syntax allows us to run a DROP TABLE statement without getting an error if the table doesn’t exist.
Earlier versions of Oracle don’t support the IF EXISTS clause. Therefore, if we want to avoid any nasty errors resulting from trying to drop a non-existent table, we need to do a bit of extra work.
Below are three options for dropping a table if it exists in Oracle.
How to Add an Option to sql_mode in MySQL Without Losing Existing Settings
Here are two options we can use to add an option to our sql_mode without wiping all existing options.
How to Prettify JSON Formatted Query Results in SQLcl (Oracle)
If you use SQLcl to query Oracle Database, you might be aware of the SET SQLFORMAT json option, that makes query results come back as JSON documents.
But there’s also a json-formatted option, which returns the results in a more human readable format.
How to List All Stored Procedures in Oracle Database
There are several data dictionary views that we can use to return a list of stored procedures in Oracle Database.
How to Remove Leading Zeros From Dates in Oracle
In Oracle Database, you can use the fm (fill mode) format modifier to suppress any leading zeroes that might be applied to a date. This format modifier suppresses padding, which includes leading zeros and trailing blanks.
To use the fm format modifier, include it in your format model when specifying how dates should be formatted. For example when using the TO_CHAR() function to format dates, or in NLS parameters such as the NLS_DATE_FORMAT parameter when setting the date format for your current session.
2 Ways to List all Functions in MariaDB
Below are two options for returning a list of functions in MariaDB.
4 Ways to List the Views in an SQLite Database
Here are four options for showing all views within an SQLite database.
PostgreSQL GROUP_CONCAT() Equivalent
Some RDBMSs like MySQL and MariaDB have a GROUP_CONCAT() function that allows you to return a query column as a delimited list (for example, a comma separated list).
PostgreSQL has a similar function called STRING_AGG(). This function works in pretty much the same way that GROUP_CONCAT() works in MySQL and MariaDB.