I am using MySQL, I have a table that has 9 columns. One of them is the primary key.
How can I select a single row, by the primary key or column 8 or 4?
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Answer
If I understand your question correctly:
SELECT * FROM tbl WHERE id = 123 OR colname4 = 'x' OR colname8 = 'y' LIMIT 1
The ‘LIMIT’ keyword makes sure there is only one row returned.