Oracle query on String [duplicate]

This question already has answers here: 开发者_C百科 ORA 00904 Error:Invalid Identifier (2 answers) Closed 2 years ago.

I want to perform my query on a string in this format, xxxx/xxxx

where x is a number. when I perform it using the Oracle interface or my C# application I get this error:

ORA-00904: "xxxx/xxxx": invalid identifier

I performed this query:

SELECT * FROM "My Table" WHERE Field="xxxx/xxxx"

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You should use single quotes aroung SQL character literals like xxxx/xxxx:

SELECT * FROM "My Table" WHERE Field='xxxx/xxxx'