E021-09, “TRIM function”, is defined in ISO/IEC 9075-2:2023 as mandatory feature. The trim() function, including all the ability to specify the remove character and the both, leading, trailing and from keywords was already part of Intermediate SQL-92.
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Markus Winand provides insights into SQL and shows how different systems support it at modern-sql.com. Previously he made use-the-index-luke.com, which is still actively maintained. Markus can be hired as trainer, speaker and consultant via winand.at.