What is the SQL grammar used for addSql in Doctrine?

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The SQL grammar used for addSql in Doctrine is the standard SQL syntax, which includes keywords such as SELECT, INSERT, UPDATE, DELETE, JOIN, WHERE, GROUP BY, ORDER BY, and various operators such as AND, OR, IN, NOT IN, BETWEEN, LIKE, etc. The specific syntax depends on the database platform being used, and Doctrine automatically generates the appropriate SQL statements based on the Doctrine entity mapping metadata.