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Umut TEKIN: Can Collations Be Used Over citext?
Recently, I read Laurenz Albe's blog about case insensitive string search. He recommended case insensitive collations saying, "it won't be any more expensive (and maybe more intuitive) than the current techniques of using upper() or the citext extension are today". In other words, a custom collation can be used instead of citext to achieve case insensivity with a lower performance penalty.
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