分类: 数据库开发技术
2008-03-14 13:36:26
CREATE TABLE table_name(
column1 DATATYPE ,
column2 DATATYPE ,
...);说明:DATATYPE - - 是资料的格式,包括: int 4 BYTES
long 4 BYTES
float 8 BYTES
date
char( NUM ) NUM :数目,用户定义 2、建立索引: CREATE INDEX index_name ON table_name (column_name);说明:对某个表格的栏位建立索引以增加查询时的速度。
DROP TABLE table_name;4、删除索引:
DROP INDEX index_name;二、资料操作DML (Data Manipulation Language)
INSERT INTO table_name (column1,column2,...)
VALUES ( value1,value2, ...); 说明: SELECT column1,columns2,...
FROM table_name; 说明: SELECT *
FROM table_name
WHERE column1 = xxx1
and column2 = xxx2 ...;说明: SELECT *
FROM table_name
WHERE column1 between xxx1_1 and xxx1_2 and
column2 between xxx2_1 and xxx2_2 ...; 说明: UPDATE table_name
SET column1 = ''xxx′
WHERE conditoins; 说明: DELETE FROM table_name
WHERE conditions; 说明:删除符合条件的资料。EXIT;