When To Use Double Quotes Vs Single

In recent times, when to use doublequotes vs single has become increasingly relevant in various contexts. What is the difference between single and doublequotes in SQL?. Single quotes are used to indicate the beginning and end of a string in SQL. Double quotes generally aren't used in SQL, but that can vary from database to database. Furthermore, stick to using single quotes.

Similarly, that's the primary use anyway. You can use single quotes for a column alias — where you want the column name you reference in your application code to be something other than what the column is ... When to use single quotes, double quotes, and backticks in MySQL. Consult the Date and Time Literals documentation for more details, in particular alternatives to using the hyphen - as a segment delimiter in date strings.

So using your example, I would double-quote the PHP string and use single quotes on the values 'val1', 'val2'. Furthermore, nULL is a MySQL keyword, and a special (non)-value, and is therefore unquoted. python - Single vs double quotes in JSON - Stack Overflow.

I like this answer the best: you don't often have a choice: if someone gives you single quotes, you got single quotes. Either json.loads needs an extra argument, or you should use this. Are double quotes and single quotes interchangeable for string literals .... The most likely reason for use of single vs. double quote in different libraries is programmer preference and/or API consistency.

Other than being consistent, use whichever best suits the string. Using the other type of quote as a literal: double quotes in Python - Stack Overflow. I like to use double quotes around strings that are used for interpolation or that are natural language messages, and single quotes for small symbol-like strings, but will break the rules if the strings contain quotes, or if I forget.

Another key aspect involves, html - Single vs Double quotes (' vs ") - Stack Overflow. To answer the question about whether using single- vs double-quotes as means to determine hand-written vs generated HTML, no it's probably not a good idea. While code that is inconsistent (uses single in some places, double in others) is probably hand-written, I'm sure plenty of people (including myself) use double-quotes everywhere, but our code certainly isn't computer-generated ;) 11 Single quotes are for a single character.

In relation to this, double quotes are for a string (array of characters). In relation to this, you can use single quotes to build up a string one character at a time, if you like. Do I need quotes for strings in YAML? A few points to consider: example 1 - all strings use double quotes; example 2 - no strings (except the last two) use quotes; the YAML cookbook says: Enclosing strings in double quotes allows you to use escaping to represent ASCII and Unicode characters.

Does this mean I need to use double quotes only when I want to escape some characters? The biggest difference between the types of quotes is that enclosed identifier references are substituted for inside double quotes, but not inside single quotes.