January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Dynamic SQL
Dynamic SQL is used to build and execute queries on the fly. Unlike a static SQL statement, a dynamic SQL statement's full text is unknown and can change between successive executions. These queries can be DDL, DCL, and DML statements. Dynamic SQL is used to reduce repetitive tasks. For example, you could use dynamic SQL to create table partitioning for a certain table on a daily basis, to add missing indexes to all foreign keys or to add data auditing capabilities to a certain table, without major coding effects. Another important use of dynamic SQL is to overcome the side effects of PL/pgSQL caching, as queries executed using the EXECUTE statement are not cached.
Dynamic SQL is achieved via the EXECUTE statement. The EXECUTE ...
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