Database: california_schools
Question: Rank schools by their average score in Writing where the score is greater than 499, showing their charter numbers.
SQL: SELECT CharterNum, AvgScrWrite, RANK() OVER (ORDER BY AvgScrWrite DESC) AS WritingScoreRank FROM schools AS T1  INNER JOIN satscores AS T2 ON T1.CDSCode = T2.cds WHERE T2.AvgScrWrite > 499 AND CharterNum is not null