Oracle Learning ----- basic SQL select statement

First, the basic select statement

　　SELECT id select those columns

　　FROM identifies the table from which to select

　　　　select * Select All logo

　　　　select department_id, location_id

　　　　from departments; selecting a particular column

note:

　　SQL language is not case sensitive

　　SQL can be written in one or more rows

　　Keywords can not be abbreviated nor branch

　　Each clause of general branches write

　　Use indentation to improve readability statement

Second, the arithmetic operators

Numbers and dates of use of arithmetic operators (multiplication and division can not be used date)

Operator Description

+ Plus

- Less

* Multiplication

/ Division

Operator precedence

*　　/　　+　　-