thewiredbear
thewiredbear
/ pure_sql_scd_update.sql
Created
January 16, 2026 00:14
— forked from raven-rock/pure_sql_scd_update.sql
"Pure SQL" algorithm for updating of slowly changing dimension (SCD Type 2) table records with just two DML statements (SQLite example)
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| -- SQLite | |
| -- Test: sqlite3 -header -echo -column :memory: < % | |
| create table t1 ( | |
| bk int | |
| , valid_from datetime default CURRENT_TIMESTAMP | |
| , valid_to datetime default '9999-12-31 23:59:59' | |
| , a1 varchar(20) | |
| , primary key (bk, valid_from) | |
| ); |