http://social.technet.microsoft.com/wiki/contents/articles/5392.active-directory-ldap-syntax-filters.aspx?Sort=MostUseful LDAP Clauses A filter specifies the conditions that must be met for a record to be included in the recordset (or collection) tha…
摘抄自hbase ref guide 0.94: 在写本文的时候,hbase ref guide已经更新到1.2及2.0了,但是个人感觉Thrift过滤语法部分写得都没有0.94的好,省掉了example,看起来很不方便,也不便于在hbase shell中进行调试,因而复制一份过来,以免以后找不到: ------------- 10.3. Thrift Currently most of the documentation on Thrift exists in the Apache HBase…
sql语句进行 like和in 参数化,按照正常的方式是无法实现的 我们一般的思维是: Like参数化查询:string sqlstmt = "select * from users where user_name like '%@word%' or mobile like '%@word%'";SqlParameter[] Parameters=new SqlParameter[1];Parameters[0] = new SqlParameter("@word"…
--1:无ORDER BY排序的写法.(效率最高)--(经过测试,此方法成本最低,只嵌套一层,速度最快!即使查询的数据量再大,也几乎不受影响,速度依然!) SELECT * FROM (SELECT ROWNUM AS rowno, t.* FROM emp t WHERE hire_date BETWEEN TO_DATE ('20060501', 'yyyymmdd') AND TO_DATE ('20060731', 'yyyymmdd') ) table_alias ; --2:有ORD…
--1:无ORDER BY排序的写法.(效率最高)--(经过测试,此方法成本最低,只嵌套一层,速度最快!即使查询的数据量再大,也几乎不受影响,速度依然!) SELECT * FROM (SELECT ROWNUM AS rowno, t.* FROM emp t WHERE hire_date BETWEEN TO_DATE ('20060501', 'yyyymmdd') AND TO_DATE ('20060731', 'yyyymmdd') AND ROWNUM <= 20) table_…
--1:无ORDER BY排序的写法.(效率最高) --(经过测试,此方法成本最低,只嵌套一层,速度最快!即使查询的数据量再大,也几乎不受影响,速度依然!) SELECT * FROM (SELECT ROWNUM AS rowno, t.* FROM emp t WHERE hire_date BETWEEN TO_DATE ('20060501', 'yyyymmdd') AND TO_DAT…
单表查询语法 SELECT DISTINCT 字段1,字段2... FROM 表名 WHERE 条件 GROUP BY field HAVING 筛选 ORDER BY field LIMIT 限制条数 关键字执行的优先级 from where group by select having distinct order by limit 1.找到表:from 2.拿着where指定的约束条件,去文件/表中取出一条条记录 3.将取出的一条条记录进行分组group by,如果没有group by,则…
一.SQL子查询语句 1.单行子查询 select ename,deptno,sal from emp where deptno=(select deptno from dept where loc='NEW YORK'): 2.多行子查询 SELECT ename,job,sal FROM EMP WHERE deptno in ( SELECT deptno FROM dept WHERE dnam…
DataView的RowFilter 实现过滤 根据文本框文字对datagridview的数据进行模糊查询, 其实也就是一个过滤 string qymc = textBox1.Text.ToString(); //获取文本框要模糊查询的文字 using (SQLiteConnection con = new SQLiteConnection(DATASOURCE)) { con.Open(); using (SQLiteCommand cmd = new SQLiteCommand()) { c…