Introduction
SQL is an old language — almost 50 years! The first commercially-available version of SQL was released by Oracle way back in 1969. In its specifications and general, “standard” appearance, it resembles the other leading language of the day, COBOL. Language theory and computer languages have evolved considerably since then. Modern concepts such as object-oriented programming and functional programming are not well-represented in SQL. That’s a pity. It can lead to copying code which almost always increases maintenance costs and code fragility.
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