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PostgreSQL Constraints: Learning PostgreSQL with Grant - Simple Talk
| | parvu.org
Oracle Database: Constraints Tutorial - Est. 2016
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| | This article compiles various queries and code blocks used to manage disabled constraints in a database schema. It includes SQL statements to identify and enable these constraints. The content will be updated regularly with new insights, and it lists the tested database versions, starting with Oracle Database 23ai.
| | modern-sql.com
MERGE | SQL
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| | All functions of MERGE explained by example. Support tables show which systems support it.
| | antonz.org
Upsert in SQL
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| | Inserting and updating data with a single query.
| | connor-mcdonald.com
The APEX data dictionary - Learning is not a spectator sport
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| Anyone who has used APEX will know that in addition to the Builder UI, there is a comprehensive data dictionary for APEX-prefixed views to expose all the metadata associated with APEX applications and workspaces. SQL> select view_name 2 from dba_views 3 where owner = 'APEX_240200' 4 and view_name like 'APEX%' 5 order by 1;...