1、免费重修；
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        3、推荐机会。

• RDBMS (Relational DataBase Management System)
  Relational Operators
  SQL as Declarative Language
  SQL Syntax
  SQL Sublanguages DQL, DML, DDL, DCL
  DQL (Data Query Language) in Detail
  SELECT clause
  Column aliases
  Table aliases
  Date types and Date functions
  Group function
  Table joins
  JOIN clause
  UNION operator
  Nested queries
  Correlated subqueries
  DML (DataManipulationLanguage) Overview
  Inserting rows (INSERT)
  Inserting rows using subquery
  Updating rows (UPDATE)
  Deleting rows (DELETE)
  DDL (Data Definition Language) Overview
  Creating, altering and dropping objects (CREATE, ALTER, DROP)
  Creating tables using subquery (CREATE TABLE .... AS SELECT...)
  CONSTRAINTS Overview
  NULL i NOT NULL
  CONSTRAINT clause
  ENUM type
  SET type
  PRIMARY KEY
  UNIQUE
  FOREIGN KEY
  DEFAULT clause
  Transactions Overview
  COMMIT
  ROLLBACK
  SAVEPOINT
  Implicit and explicit rollbacks and commits
  T-SQL Dialects Overview
  What is Transact-SQL
  T-SQL and portability with other dialects (what to avoid)
  Handling Date