The syntax for the IF EXISTS clause (SQL Server 2019 and later)

# Method 1 

USE master;

DROP DATABASE IF EXISTS TestDB;

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Test if a database exists before deleting it

# Method 2

USE master;

IF DB_ID('TestDB') IS NOT NULL

    DROP DATABASE TestDB;

CREATE DATABASE TestDB;

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Another way to test for the existence of a table

# Method 3

IF EXISTS (SELECT * FROM sys.tables

WHERE name = 'InvoiceCopy')

DROP TABLE InvoiceCopy;