Final answer:
In Snowflake, a string constant is enclosed in single or double quotes, with special rules for escaping quotes inside the string. Consistent use of quotes is essential in SQL queries.
Step-by-step explanation:
In Snowflake, a string constant can be enclosed in either single quotes ('...') or double quotes ("..."). When using single quotes inside the string, you should escape them by doubling up (e.g., 'O\'Reilly'). Similarly, when using double quotes inside the string, you should escape them by using double double-quotes (e.g., "She said, \"Hello\""). This rule helps to prevent any confusion that might arise from string delimiters within the string itself.
It's important to be consistent with the use of quotes in Snowflake SQL queries, especially since different databases have varying rules regarding string constants. However, Snowflake's flexibility with quotes makes it convenient for developers to include special characters or construct queries dynamically.