visual basic sql query

Sub-query(used for querying between two tables, etc.)The query inside the parentheses can only display information for one columnSelect *from haha where age in (Select MAX (age) from haha where bumen = ' sales Department ') and Bumen in (Select Bumen from haha group by bumen have COUNT (*) >5)---Practice: The information of the first, the person according to the age from small to largeSelect top 3 *from hah

ORACLE basic SQL statements-query, oraclesql statements 1. Common Query /* Query table data */Select * from STU /* Retrieve the first three rows of Data */Select * from stu where ROWNUM /* Fuzzy query */Select * from stu where s

Basic SQL query language tutorial (3) 4. create table statementThe syntax of the create table statement is:Create Table (field1 type [(size)] [not null] [index1][, Field2 type [(size)] [not null] [index2] [,...][, Constraint multifieldindex [,...]) TableName of the newly created tableField1 type [(size)] [not null] [index1]Field1 is the field name, type is the fi

Operational sequencingFromOnJoinwhereGROUP BYWith cube or with rollup notHavingSelectDistinctORDER BYTopSelect *from ... Querying all dataA convenient process for filtering dataStart position from =c# foreach where filter condition =foreach{loop body If judgment} Select mapping Transcription * Copy line Select to last run from middleTopHow many bars before filteringSelect top 2 *from ... where: Like '%.. %‘Top Last RunLike fuzzy query% _ [] [^]_ occup

nianling Desc (Descending)--In descending order, check the top twoSelect top 2 *from fenshu ORDER BY nianling Desc--Combined sorting* Separated by ","Select *from Score ORDER by Cno Asc,degree desc--Sort by conditional query. Look for the person named John Doe, and choose the top three highSelect Top 3 *from fenshu where name = ' John Doe ' ORDER by nianling DescCast (column name as data type)* On behalf of all, change * To column name, you can displ

DAY03 Basic Query SQL statementsFirst, overview:Learn MySQL database must learn SQL query function, plainly, the use of the database is to store data, query data, the use of such data a process. It is only after viewing that we kn

Original address: http://www.cnblogs.com/yank/p/3672478.htmlSQL queries are simple things, but often make mistakes because of simple things. We forget the basic syntax of SQL queries when we encounter some more complex queries.This article hopes that through the simple summary, the commonly used query method summarizes, hoped can clear in the heart.Scenario: Stud

visual| Security | program | programmers | Solving problems the security issues that visual Basic. NET and Visual C #. NET programmers need to address Robin Reynolds-haertle Visual Studio Team Microsoft Corporation January 2002 Summary:This article focuses on the major sec

BY clause is as follows: [ ORDER BY {order_by_expression [ASC | desc[]] The main parameters are described below:Order_by_espression: Specifies the column to sort, the alias of the column, an expression, or a negative integer that is specified as the location of the name, alias, or expression within the selection list.ASC: Sorts the values in the specified column in ascending order.Desc: Sorts the values in the specified column in descending order.Seven, having a filter querySee address:http

,c.scoreFrom Strdents as SRight outer join score as COn S.scode=c.strdentidDescription: Queries for rows that meet on conditions in the Strdents and score tables, with the same sconde as score tables in the Strdents table 【 differences between left and right outer joins：Left join the data in the table to the left is the baseline (not even the right table in the left table), if the left table has data on the right table without data, the data in the right table showing the data in the left table

Use SQL query:SQL query Basic syntax:SELECT [all| DISTINCT] [TOP ([Groud by[Have [ORDER by [For XML {row| auto| Explicit| path[([OPTION (The SQL statement above looks very complex. Now we are going to explain.SELECT tells SQL what to do. From the table to be manipulated (not

Label:There are three sub-queries: Where sub-query, from sub-query, exist subquery.where sub-queryWhere subquery: refers to the query result of the inner layer as the comparison condition of the outer query. Example: Check out the latest product: Select Good_id,good_name from good where good_id = (se

GROUP by in the query statement, or you will get an error. For example:1, select Ordernumber,count (*) from Lu_order GROUP by OrderNumber have ordernumber in (' 1 ', ' 2 ', ' 3 ')--->orde Rnumber the same group, the number of tuples contained in each groupSix limit wordsLimits the number of bars the result displays.For example:1, query the first 3 rows of data: SELECT * from Lu_order limit 0,3Seven Multi-

1.FROM clauseSELECT SELECT to specify the columns to queryfrom specifies which table to query fromIf you query all columns, you can use the * number after SelectIf you are querying only a specific column, you can specify the column name directly after the select and the column names are separated by commas.2. Using aliasesUsing the syntax is the alias of the column followed by the column name, the middle ca

I. Overview of SQL　　Origins in the standard no longer repeat, mainly divided into ddl,dml,dclFor an introduction, refer to MySQL section : http://www.cnblogs.com/jiangbei/p/6696202.html　　Objective of this section:by studying this chapter, you will be able to: enumerate the functions of the SQL SELECT statement.　　Executes a simple SELECT statement. SQL languagedif

used in a GROUP by clause;5. Specify the conditions for the aggregation result:? ? Use the HAVING clause to specify the conditions for grouping:? ? SELECT ? ? From ? ? GROUP by ? ? Having ? ? Such as:? ? SELECT Shohin_bunrui,? COUNT (*)? ? From Shohin? ? GROUP by Shohin_bunrui? ? Having COUNT (*) = 2;? ? Having is used to specify a condition for a group, where (although a similar effect can be achieved with having) if the condition of the specified row corresponds6. Sort the results of a

Label:1. Querying data Select Property List From table name and view list [Where Condition expression 1] [Group By property name 1 [having conditional expression 2] [with rollup the last record is the sum of the above Records]]//The field specified by the attribute name 1 is grouped, there is having to satisfy the conditional expression 2 [Order BY property name 2 [Asc|desc]] where query condition: Compare =, Specify the range between and, not betwee

Tags: des style blog color ar div sp Log onSELECTR.* fromTrans_flow R, (SELECTOrder_no,MAX(Status_time) asStatus_time fromTrans_flowGROUP byorder_no) SWHERER.order_no=S.order_no andR.status_time=S.status_timeORDER byR.status_timeDESC SELECTA.order_no,a.mem_no,c.card_no,c.card_holder,c.bank_name,c.branch_bank_name,a.flag, A.income_type_txt,a.amt, A.create_time fromAccount_log aJOIN(SELECTB.*,MAX(ID) fromAccount BGROUP byb.mem_no) C onDate_add (A.create_time, INTERVAL7 Day)Now () andA. ' Mem_

Original: ActiveReports 9 new features: Visual Query Designer (VQD) IntroductionAdded new features to the newly released ActiveReports 9 report control to help you create a beautiful, powerful reporting system in less time, this article focuses on the Visual data Query Designer, without having to manually write any

ActiveReports 9 new function: Introduction to the Visual Query designer (VQD), activereportsvqdZookeeper Added multiple new features to the recently released ActiveReports 9 Report control to help you create a brilliant and powerful report system in a shorter period of time, this article will focus on the visual data query