How to check if a row exists in MySQL? (i.e. check if username or email exists in MySQL)

phpmysqlmysqlipdo
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Can I concatenate multiple MySQL rows into one field?

mysqlsqlgroup-concatconcat
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How can I SELECT rows with MAX(Column value), PARTITION by another column in MYSQL?

mysqlsqlgreatest-n-per-groupmaxdistinct
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INNER JOIN ON vs WHERE clause

mysqlsqljoininner-join
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How to do a regular expression replace in MySQL?

mysqlregexmysql-udf
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