Susang questions

Susang answers

• SQL Select the most recent record for each ID
• How to update zeros with the first non-zero value from a following row?
• An error appear when I use "DROP TABLE IF EXISTS" in SSMS v.17.1
• How conditional join if first matching has no row, use second matching
• How to apply same COALESCE argument across a number of columns
• How to declare Array variable in SQL Server?
• Why does this MYSQL UPDATE query take 2 minutes to run?
• Must declare the scalar variable "@PreviousAmount"
• SQL Server Update column comparing cross row's value