Summary of "Sql Advanced Tutorial"

1 Magic SQL

1.1 case expression

The statements are as follows:


First method:

Second method:

1.2 Usage of self-connection

1.3 Three-valued logic and NULL

1.4 The power of the HAVING clause

1.5 Usage of outer joins

1.6

1.7

1.8

1.9

1.10

1.11

1.12