The number of placeholders in an SQL statement can be determined by counting the number of ? parameters in it. For example, in my previous example there are two parameters which are ? parameters: "id = ?" and "name = ?".
By changing one parameter to a fix value it would have only one placeholder. For example:
SELECT * FROM users WHERE id = ? AND name = "John Doe"

As you can see, in this modified SQL statement the "name" parameter was changed to "John Doe" from a placeholder, so now only the "id" parameter is a placeholder.
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