常用SQL语句

1. SELECT <FIELD_NAME1>, <FIELD_NAME2> FROM <TABLE_NAME> WHERE (<FILED_NAME3> ='xxx'  OR <FILED_NAME3> ='ZZZ')  AND   <FILED_NAME4> ='YYY'  ORDER BY <FIELD_NAME1> ASC <FIELD_NAME2> DESC.

表中取两列

2. SELECT DISTINCT <FIELD_NAME1> FROM <TABLE_NAME>：表中取某列的唯一值。

3. SELECT SUM(<FIELD_NAME1>)  .. 取总和

4. INSERT INTO <TABLE_NAME> (<FIELD_NAME1>,<FIELD_NAME2>)VALUES (<VALUE1>, <VALUE2>) 表格中插入行。

5. UPDATE <TABLE_NAME> SET <FIELDS_NAME> ='xxx' WHERE  <FIELDS_NAME2> ='yyyy'. 更新列.

6. DELETE FROM <TABLE> WHERE <FIELD_NAME> = 'XXXX'. 删除行.

7. LIKE 'N%' 'G%','%INO%',   NOT LIKE '%INO%', like 'C_r%er' , like '[ALN]%'

8 WHERE <FIELD_NAME> IN 'VALUE1, VALUE2'

9 SELECT PO.ORDERID, P.LASTNAME, P.FIRSTNAME FROM PERSON AS P, PRODUCT_ORDERS AS PO WHERE P.LASTNAME = 'ADAMS' AND P.FIRSTNAME = 'JOHN'.