Android ---sql语句

具体应用过的:
01)删除所有的数据
执行sql语句db.execSQL(“delete from table”);
调用delete方法db.delete(table,null,null);

02)删除id>20的所有数据
String sql = “delete from ” + mDatabaseHelper.DATABASENAME + ” where id in (select id from ” + mDatabaseHelper.DATABASENAME + ” where id>20);”;
mDb.execSQL(sql);

几个简单的基本的sql语句
选择:select * from table1 where 范围
插入:insert into table1(field1,field2) values(value1,value2)
删除:delete from table1 where 范围
更新:update table1 set field1=value1 where 范围
查找:select * from table1 where field1 like ’%value1%’ (所有包含‘value1’这个模式的字符串)—like的语法很精妙,查资料!
排序:select * from table1 order by field1,field2 [desc]
总数:select count(*) as totalcount from table1
求和:select sum(field1) as sumvalue from table1
平均:select avg(field1) as avgvalue from table1
最大:select max(field1) as maxvalue from table1
最小:select min(field1) as minvalue from table1[separator]

参考http://blog.csdn.net/robertcpp/article/details/18261885

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