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Today, write a little bit complex stored procedures easy to overlook the points hit two share. If you have just encountered the same problem cheese can be less entangled bit, so what's the technical content of the wood. . . 1, an example of a stored

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Reference material Oracle N records in random http://hpitcn.iteye.com/blog/676330 1 dbms_random.random [commonly used method (for a random data)] select * from (select t.* from T t order by dbms_random.random) where rownum<2; 2 internal function sys_

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Basic operation of a number of issues (of which there are individual issues left over after the solution be modified to come): 1) How to view the entire VOB version tree: View of a VOB - Right - ClearCase - Version Tree, but the tree labeling informa

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1, take the first N records Oracle: Select * from TableName where rownum <= N; DB2: Select * from TableName fetch first N rows only; 2, to obtain the system date Oracle: Select sysdate from dual; DB2: Select current timestamp from sysibm.sysdummy1; 3

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select * from (select rownum rn, t. * from table table t) where rn between n and m [Note:] ROWNUM RN must be renamed to a virtual or other name ------------------------ The following is an update to the M of the first N records need attention -------

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select * from (select * from emp e where e.sal < 1000 order by e.empno) t order by t.sal desc; This SQL query containing a sub-sub-query can be performed while this SQL Quote select * from emp where dept in (Select dept from valid_deps where dept_hea

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(8) SELECT (9) DISTINCT (11) <TOP_specification> <select_list> (1) FROM <left_table> (3) <join_type> JOIN <right_table> (2) ON <join_condition> (4) WHERE <where_condition> (5) GROUP BY <group_by_list> (6) WI

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START WITH... CONNECT BY... Clause used to achieve the level of SQL queries. Just saw a very interesting post, the landlord used the mathematical method of connect by in-depth study Original post below. For the connect by, now most people are already

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- COUNT, if the database table with no data, count (*) does not return null, but 0 - Avg, max, min, sum - Use the NVL () function forces group functions to handle null values select avg (nvl (comm, 0)) from emp; - Used in the WHERE clause does not al

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Data development - the classic 1 in alphabetical order: Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as / / from less to more (2) Database Encryption: select encrypt ('original password') select pwdencrypt ('original pa

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Oralce database oracle rownum pseudo field we used to query for paging please refer to the principle of rownum http://tenn.iteye.com/blog/99339 As the statement is executed after Mr. rownum into the order by clause, and therefore did not sort the res

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select id,name,class,date from( select id,name,class,date ,row_number() over(partition by class order by date desc) as rowindex from table1)a where rowindex<=5 One class is the class field rowindex <= 5 out of the top 5

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1, system time Oracle: SYSDATE SQLSever: getdate () Access: date () or now () 2, the first n records check Oracel: Select * From (Select ... ...) where rownum <= 10 ((Select ... ...) is to really check the statement) SQLServer: Select * From ... ...

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1. Dynamically update a field update ot_dstrregtaxpayerbasic set taxofficialcode = (select taxofficialcode from tb_basic_enterprisebasicinfo where tb_basic_enterprisebasicinfo.taxregcode = ot_dstrregtaxpayerbasic.taxregcode) 2. By date sort N records

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1 Dynamic update a field update ot_dstrregtaxpayerbasic set taxofficialcode = (select taxofficialcode from tb_basic_enterprisebasicinfo where tb_basic_enterprisebasicinfo.taxregcode = ot_dstrregtaxpayerbasic.taxregcode) 2 sorted by date, read the fir

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/ * Title: An English-Chinese dictionary contains N records, each record has two fields: one is the English word, the other is the Chinese interpretation. Individual records by order of the English word dictionary, the English words are not repeated.

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1 in ORACLE achieve SELECT TOP N As the ORACLE does not support the SELECT TOP statement, so often used in ORACLE ORDER BY ROWNUM with a combination to achieve the SELECT TOP N query. SELECT Column 1 ... Column name n FROM ( SELECT Column 1 ... Colum

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The following sql: select * from (select rownum rn_,t_.* from (select * from PD_MODEL order by ADD_DATE DESC) t_ where rownum <= (70 + 10)) where rn_ >= (70 + 1) Meet the requirements of the record total of 268, but different parameter query passed

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From the database using a SQL statement to obtain N random Table table records, the database SQL statement is slightly different, as follows: 1, MySql Select * From TABLE Order By Rand () Limit N The code efficiency is not high, their 1000 data table

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1 in ORACLE ORACLE achieve SELECT TOP N as SELECT TOP statement is not supported, so often used in ORACLE ORDER BY ROWNUM with a combination to achieve the SELECT TOP N query. In short, implementation is as follows: SELECT column names column names n

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In MySQL is to join by the way, the emphasis is usually a bit with a small table to drive a large table, and as MySQL join realization of the principle is to do loop is on the left such as the left join data cycle to drive the right of the table, suc

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oracle randomly selected n records select * from (select * from table order by dbms_random.value ) where rownum < n oracle segment of n random records obtained select * from (select * from (select a1.*,rownum rn from (select * from table) a1 where ro

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Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as (2) Database Encryption: select encrypt ('original password') select pwdencrypt ('original password') select pwdcompare ('the original password', 'encrypted password') = 1

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Principles and use of Oracle's rownum in Oracle, according to specific conditions before the query N records, with a rownum to get. select * from emp where rownum <= 5 And the book also warned, can not use rownum ">", which means that if y

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- Delete database drop database [database name] go - Create a Database create database [database name] go - Open database use the database name go - Create Table create table [table name] ( [Column name] [datatype] identity (seed growth, an increase

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1 in alphabetical order: Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as / / from less to more (2) Database Encryption: select encrypt ('original password') select pwdencrypt ('original password') select pwdcompare ('th

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SELECT * FROM (SELECT a. *, ROWNUM rnum FROM t_user_account a WHERE a.faultcount = 4) WHERE rnum <= 6 AND rnum> = 3

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1, sql query in yesterday's record SELECT * FROM `articles` WHERE created_at> = (current_date - interval 1 day) and created_at <= (current_date - interval 0 day) 2, associated with the three highest scores table traverse records Table a, s Which rel

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Introduced before taking a table of N records of a database of writing ... 1. ORACLE SELECT * FROM TABLE1 WHERE ROWNUM <= N 2. INFORMIX SELECT FIRST N * FROM TABLE1 3. DB2 SELECT * ROW_NUMBER () OVER (ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM <= N

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1, fetch the first N records Oracle: Select * from TableName where rownum <= N; DB2: Select * from TableName fetch first N rows only; 2, to obtain the system date Oracle: Select sysdate from dual; DB2: Select current timestamp from sysibm.sysdummy1;

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Abstract: Successful development of Chapter 1 of Oracle Applications Bitmap index is only applicable to low base (low-cardinality) value, but the frequently updated list does not apply. (So-called low cardinality column refers to this column can be o

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package lucene3; import java.io.File; import org.apache.lucene.document.Document; import org.apache.lucene.index.Term; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreDoc; imp

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Public code switching method of two numbers: /** * Exchange of two numbers * @param data Exchange of arrays * @param i Location of the array subscript I * @param j Location of the array index j */ public static void swap(int[] data, int i,int j){ //

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1, fetch the first N records Oracle: Select * from TableName where rownum <= N; DB2: Select * from TableName fetch first N rows only; 2, to obtain the system date Oracle: Select sysdate from dual; DB2: Select current timestamp from sysibm.sysdummy1;

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1, take the first N records Oracle: Select * from TableName where rownum <= N; DB2: Select * from TableName fetch first N rows only; 2, to obtain the system date Oracle: Select sysdate from dual; DB2: Select current timestamp from sysibm.sysdummy1; 3

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Copy Table 1 Copy the whole table select * into NewTableName from OldTableName Do not just copy the contents of column name select * into NewTableName from OldTableName where 1=0 Copy data between tables insert into Table1(zt) select titile from Tabl

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1 copy table Copy the entire table select * into NewTableName from OldTableName Just copy the contents of the column name instead of select * into NewTableName from OldTableName where 1=0 Copy data between tables insert into Table1(zt) select titile

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Lag and Lead functions can be removed in the same field in a query the first N rows of data and the value after the N line. This operation can be used to connect to the same table the table to achieve, but the use of LAG and LEAD have higher efficien

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In MySQL, you can use the Limit to check out the first m columns to n records, such as: select * from tablename limit m, n However, in SQL Server is not supported Limit statement. How to do it? Solution: Although SQL Server does not support Limit, bu

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First, a disorder known bubble sort the data a [1], a [2], ... ... a [n], must be in ascending order. First compare a [1] and a [2] the value, if a [1] over a [2] the value of the exchange between the two, otherwise unchanged. Then compare a [2] and

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GOOGLE Baidu used or people should have the impression, when you enter some keywords in the search box, then, it will prompt the relevant search keywords, for example, I type "g", will be prompted to "google", "gmail" a class

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Principles and use of Oracle's rownum In Oracle, the query according to certain conditions, the first N records, with a rownum to get. select * from emp where rownum <= 5 And the book also warned, can not use rownum ">", which means that i

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How to get the Oracle database before implementing several data methods? Is similar to the SQL statement SELECT TOP N method. This article will tell you the answer, illustrated yo! 1 in Oracle to achieve SELECT TOP N: As the ORACLE does not support t

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The one we have built the index, following the use of the index to do a proper business. This is a basic search function to implement the sample code: Java code Directory dir = FSDirectory.open (new File ("index "))); IndexSearcher searcher = ne

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SQL Cookbook The first chapter, to retrieve data 1.7 out plants connected select ename | | 'WORKS AS A' | | job as msg from emp where deptno = 10 1.8 in a SELECT statement using conditional logic select ename, sal, case when sal <= 2000 then 'UNDERPA

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Assumes that the table name: user select * from user order by rand() limit 1,50 order by rand () that the query to sort the data out of order (once out of order every time, in theory, will not repeat a limited number of times) limit 1,50 said the res

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SELECT count(B.VALUE_SX_BTXM) INTO V_BTBZCOUNT FROM DM_SX_BTXM A, XX_SX_BTXM B WHERE A.DM_BTXM = B.DM_BTXM AND A.DM_SX_BTXM = B.DM_SX_BTXM AND A.DM_BTXM = VI_DM_BTXM AND A.DM_SX_BTXM =VI_DM_SX_BTXM AND b.dm_xzqh=VI_XZQH AND b.btnd = VI_BTND AND A.LX_

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Reproduced: honeydh (http://www.51testing.com/?uid-191521-action-viewspace-itemid-101702) 1.1.1 take the first n records SQL Server: Select top n * from xtable Oracle: Select * from xtable where rownum <= n DB2: Select * from xtable fetch first n row

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1 in alphabetical order: Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as / / from less to more (2) Database Encryption: select encrypt ('original password') select pwdencrypt ('original password') select pwdcompare ('th

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1.ROWNUM use - TOP-N analysis using a SELECT statement to return the result set, if they want to query by specific conditions, the first N records, you can use the pseudo-column ROWNUM. ROWNUM is the result set plus a pseudo-column, which is to be fo

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