I’ve come to this realization in my career as a database developer. As soon as I saw the “%” in question, I knew it was something for me to keep in mind. The “%” is a special character that is used in SQL queries to escape certain values.
This is a serious character, so I’m not saying that you should ever, ever, ever, ever, ever use one. That just isn’t right. But I’m also not saying you should never write a query that uses a special character. So if you do, you’ll have to make sure you know how to use them.
A backslash in a query can be interpreted by the SQL engine as a single quote, which means the SQL engine can treat it as ordinary text. But a backslash in a query is not, in itself, a special character. It is just one character in a list, and the SQL engine can treat that character as a literal in its own way. For example, the SQL engine will treat “SELECT 1” as the literal “SELECT”.
Here’s the kicker though, if you want to make sure you’re writing a valid query (and even if you don’t), you should always quote values if you need to use them.
The other thing I learned in SQL is that the backslash character is also used in the string literal notation. This is the syntax for a SELECT that takes a parameter and returns an integer.
So basically you can use the backslash character to escape any string literal. Just be sure to quote the value you’re passing in.
It’s not always necessary to escape or quote a value, as long as you quote it. But this is a good rule to follow when you’re writing SQL queries. In your example it would have been preferable to put a backslash before the quotation marks.
Some of the characters in this line are really very weird. I think that it is a good rule to follow when youre writing SQL queries. The most obvious thing would be to use backslash in quotes for all the characters in the line. But it’s not always necessary to use backslashes in quotes for all the characters in the line. We have some examples using the string literal “p”. This is the most commonly used backslash.
You can also use the string literal ” for all the characters in the line. This is just about the most common case. But again, it is not always necessary to use the string literal in this case.