基础

• SELECT
  [DISTINCT] column_name
  [TOP number|percent column_name(s)]
  [AS alias_name_for_column]
  FROM table_name
  [
  WHERE column_name
  [operator value]
  [AND column_name operator value ] [OR column_name operator value ]
  [LIKE pattern]
  [IN (value1,value2,…)]
  [BETWEEN value1 AND value2]
  ]
  [AS alias_name_for_table]
  [ORDER BY column_name ASC|DESC] ;

• DISTINCT: 不重复

• TOP: 选择少数记录

• INSERT INTO table_name [(column1,column2,column3,…)]
  VALUES (value1,value2,value3,…) ;

• UPDATE table_name
  SET column1=value1,column2=value2,…
  WHERE some_column=some_value;

• DELETE FROM table_name
  WHERE some_column=some_value;

pattern

• ‘%’ 代表任意数量任意字符
• ‘-‘ 代表单个字符
• ‘[char]’ 代表方括号内任意字符
• ‘[!char]’ or ‘[^char]’ 代表不存在方括号内任意字符
• eg. SELECT * FROM Customers WHERE City LIKE '[a-c]%';

join

• SELECT column_name(s)
  FROM table1
  INNER|LEFT|RIGHT|OUTER JOIN table2
  ON table1.column_name=table2.column_name;

misc

• union 合并两个select的结果，不显示duplicate的结果
• union all 合并两个select的结果，显示duplicate的结果
• select into from 从现有表创建新表
• insert into select from 插入表