奇数没有这样的列错误SQLite3

Question

I'm only beginning to learn SQL with SQLite3 so this question probably has a clear answer, which I just can't think of. I have a table called Books, which has the columns: name, author and price. When I type eg select name, price from Books where author = "A"; in sqlite3, it works just fine. However, when I make a .sql file with the following:

 SELECT name, price
 FROM Books
 WHERE author = "A";`

and read the file in the same database, it reads

 'Error: near line 1: no such column: "A"'

Any ideas?

Edit: I have also tried the same with single quotes (ie 'A') but it still gives the same error:

Error: near line 1: no such column: 'A'

Answer 1

Double quotes "A" are used as identifiers; you want to use single quotes 'A' for string literals. See the documentation for more information.

SELECT name, price FROM Books WHERE author = 'A' ;

The reason it worked in the first example is probably due to this:

If a keyword in double quotes (ex: "key" or "glob") is used in a context where it cannot be resolved to an identifier but where a string literal is allowed, then the token is understood to be a string literal instead of an identifier.

Answer 2

I found the solution. I was using Mac's TextEdit program to write the SQL queries and it uses so called "smart quotes", which are not recognized as quotes by SQL. So I just changed the smart quote-setting off and all is well.