We have an issue finding a way to make codemirror behave the same for single and double quote strings.
It would have been been a quick css hack but, for double quotes the css generated has no tags around it.
The single quotes have a class called "cm-string" that would be nice to have on both.

For me it is like this. I use the theme light, in the theme / light.css file line: .cm-s-light span.cm-string {color: # 3ad900; } it displays me like on the screen "" and "the same in green Search in your theme file.
AND for file sql.js in line 57:
remove:
so that it stays:
and you will get the desired effect in SQL mode.
For TCL Replace line 45 tcl.js:
such as line: