[sql] In SQL, is UPDATE always faster than DELETE+INSERT?

Large number of individual updates vs bulk delete/bulk insert is my scenario.I have historical sales data for multiple customers going back years. Until I get verified data (15th of the following month), I will adjust sales numbers every day to reflect the current state as obtained from another source (this means overwriting at most 45 days of sales each day for each customer). There may be no changes, or there may be a few changes. I can either code the logic to find the differences and update/delete/insert the affected records or I can just blow away yesterday's numbers and insert today's numbers. Clearly this latter approach is simpler, but if it's going to kill the table's performance due to churn, then it's worth it to write the extra logic to identify the handful (or none) of records that changed and only update/delete/insert those.

So, I'm replacing the records, and there may be some relationship between the old records and the new records, but in general I don't necessarily want to match the old data with the new data (that would be an extra step and would result in deletions, updates, and inserts). Also, relatively few fields would be changed (at most 7 out of 20 or 2 out of 15).

The records that are likely to be retrieved together will have been inserted at the same time and therefore should be physically close to each other. Does that make up for the performance loss due to churn with that approach, and is it better than the undo/redo cost of all those individual record updates?

Examples related to sql

Passing multiple values for same variable in stored procedure SQL permissions for roles Generic XSLT Search and Replace template Access And/Or exclusions Pyspark: Filter dataframe based on multiple conditions Subtracting 1 day from a timestamp date PYODBC--Data source name not found and no default driver specified select rows in sql with latest date for each ID repeated multiple times ALTER TABLE DROP COLUMN failed because one or more objects access this column Create Local SQL Server database

Examples related to sql-insert

In Oracle SQL: How do you insert the current date + time into a table? SQL Error: ORA-01861: literal does not match format string 01861 "Insert if not exists" statement in SQLite Column count doesn't match value count at row 1 Inserting data to table (mysqli insert) SQL Insert into table only if record doesn't exist C# with MySQL INSERT parameters How to speed up insertion performance in PostgreSQL "column not allowed here" error in INSERT statement Inserting multiple rows in mysql

Examples related to sql-delete

Delete all rows with timestamp older than x days How to delete duplicate rows in SQL Server? How to delete and update a record in Hive How to write a SQL DELETE statement with a SELECT statement in the WHERE clause? How can I delete using INNER JOIN with SQL Server? How to delete multiple rows in SQL where id = (x to y) Delete many rows from a table using id in Mysql How do I delete all the duplicate records in a MySQL table without temp tables Delete with "Join" in Oracle sql Query MySQL WHERE: how to write "!=" or "not equals"?