4.1 Create Database + 4.2 Data Table Operations (I) + 4.3 Data Table Operations (II) + 5.1 Data Update（I）+ 5.1Data Update（II）+ 5.2 Single- Table Query (I) + 5.2 Single- Table Query (II) + 5.2 Join Queries + 5.2 Nested Queries + 6.1 Viewing and Deleting View + 6.1Creating Views + 6.1 Updating Views + 6.2 Index Operations + 6.2 Concept of Indexes + 6.3 Cursors + 7.1 Variables + 7.2 User-Defined Functions + 7.3 Viewing, Executing, Modifying, and Deleting Stored Procedures + 7.3Creating Stored Procedures + 7.4 Trigger Activation and Deletion + 7.4 Creating and Viewing Triggers + 7.Transactions + 7.Transaction Isolation Levels + 7.Non-Repeatable Read + 7.Phantom Read and Serializability + 7 Dirty Read + 8.2 Creating Users + 8.2Modifying and Deleting Users + 8.3 Privilege Management + 8.4 Data Backup and Restoration +