In SQLite, we can query the sqlite_schema table to find out whether a given table exists.
Prior to SQLite version 3.33.0, this table was referred to as sqlite_master (it can still be referred to as such in subsequent releases for backwards compatibility).
We can use the FORMAT() function in MySQL to format numbers into a more human readable format.
The function returns the number as a formatted string. It adds thousands separators and a decimal separator as required, and rounds the results to the given decimal position.
Continue readingWhen using SQLcl with Oracle Database, you can export your query results to a JSON file with the SPOOL command.
Here are four ways to check whether or not a table exists in a MariaDB database.
Continue readingBelow are five ways to check if a table exists in a PostgreSQL database.
Continue readingBelow are four ways to list out the views in a MySQL database using SQL or the command line.
Continue readingThere are several ways to show a list of databases in SQL Server. Probably the easiest way is to use the sp_databases stored procedure.
The sp_databases stored procedure is a kind of SQL Server equivalent to the SHOW DATABASES command that can be used with DBMSs such as MySQL and MariaDB. OK, maybe they aren’t strictly equivalents, but based on their ease of use, they could be viewed as such from a user’s perspective.
In MariaDB, you can use the IF NOT EXISTS clause of the CREATE TABLE statement to check whether or not a table of the same name already exists in the database before creating it.
The table will only be created if there isn’t already one with the same name.
Continue readingWhen using the TO_CHAR() function to format a number in Oracle Database, you can use the V format element to a return a value multiplied by 10n (and if necessary, round it up), where n is the number of 9s after the V.
In MariaDB, we can query the information_schema.tables table to check the size of a database.
This table returns information about the tables and views in each database on the server. We can group the results and return the aggregate amounts for each database.
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