db2 select distinct

In daily work, sometimes some activities may need to win the prize or select some spot check lists ,?The order by newid () method is often used for random number selection ,?However, it is possible that distinct should be used together. At this time, such as distinct and order by newid ()?When used at the same time, an error message is displayed. If

statement to query all data with no duplicate names, you must use distinct to remove redundant duplicate records. Select distinct name from tableThe result is: NameABC It seems that the effect has been achieved, but what I want to get is the id value? Modify the query statement: Select

The DISTINCT technique and usage in the select statement are occasionally displayed in a forum about the DISTINCT technique and usage. it is written by a moderator. I think it may be helpful to some people. so it is Reprinted. convenience Below is the reprinted content Unique query for a single table: distinctUnique query for multiple tables: groupWhen using

no duplicate names, you must use distinct to remove redundant duplicate records. Select distinct name from tableThe result is: NameABC It seems that the effect has been achieved, but what I want to get is the ID value? Modify the query statement: Select distinct nam

, must have the same ID and test1 will be excluded, this is not possible, the ID is automatically increased ...Let's change the query statement:Select ID, distinct test1 from testUnfortunately, in addition to the error message you get nothing, distinct must be placed at the beginning. Is it difficult to put distinct in a where condition? Can, still error ....The

a test, success.Finally, but then, you have to ask customers to upgrade.Suddenly the spirit flashes, and since you can use the Group_concat function, can the other functions be OK?Hurriedly with the Count function a try, success, cost so much effort, originally so simple.Now release the full statement:SELECT *, COUNT (distinct name) from the table group by nameResults:ID Name count (distinct name)1 a 12 B

Tags: attr date database red Phone tail archive description Callselect/distinct operator Application Scenario : O (∩_∩) o ... Query for Bai. Description : Unlike the SELECT function in the SQL command, the SELECT and the clauses in the query expression are placed at the end of the expression and the variables in the sentence are returned;

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 在使用mysql时，有时需要查询出某个字段不重复的记录，虽然mysql提供 有distinct这个关键字来过滤掉多余的重复记录只保留一条，但往往只用它来返回不重复记录的条数，而不是用它来返回不重记录的所有值。其原因是 distinct只能返回它的目标字段，而无法返回其它字段，这个问题让我困扰了很久，用

How to use SQL select distinct, selectdistinct Duplicate values may exist in the table. This is not a problem. However, sometimes you may want to list only different values. The keyword distinct is used to return a unique value. Table: Example 1 Copy codeThe Code is as follows:Select distinct name from The resul

Select/Distinct Operator Description: Similar to the select statement in SQL commands, the select statement and the clause in the query expression are placed at the end of the expression, and the variables in the clause, that is, the results are returned. delay. Select/

Tags: NiO except implementation note technology inter picture step Figure 1 If there are duplicate rows in the UNION, they will be removed, leaving only one 1. Introduction The except and INTERSECT operators allow you to compare the results of two or more SELECT statements and return distinct values. 2. Differences The except operator returns all distinct values

Bear11.9900RGAN01 raggedy Ann4.9900RYL01 King Doll9.4900RYL02 Queen Dool9.4900Retrieving all ColumnsSELECT * from Products;Warning: Using wildcard charactersIn general, it is best not to use the * wildcard character unless you really need each column in the table. Although using wildcards can save you the hassle of not explicitly listing the required columns, retrieving the columns you don't need often reduces the performance of your search and applications.Tip: Retrieving unknown columns usin

ArticleDirectory Syntax: "Orders" table: Result: Result: SQL select distinct statement Duplicate values may exist in the table. This is not a problem. However, sometimes you may want to list only different values. The keyword distinct is used to return a unique value. Syntax: Select

Label:In the table, duplicate values may be included. That's not a problem, but sometimes you might want to just list different values (distinct). Keyword DISTINCT is used to return only different values.Grammar:SELECT DISTINCT column name from table nameUsing DISTINCT KeywordsIf you want to pick all the values from th

This chapter explains the SELECT DISTINCT statement. SQL SELECT DISTINCT Statement In a table, you might include duplicate values. This is not a problem, but sometimes you may want to list only the different values (distinct). Keyword

Tags: any body different statement class BER select repeat ProblemSQL SELECT DISTINCT StatementIn the table, duplicate values may be included. That's not a problem, but sometimes you might want to just list different values (distinct). Keyword DISTINCT is used to return only

SELECT/DISTINCT operations include 9 forms, namely simple usage, anonymous type form, conditional form, specified type form, filter form, shaping type form, nested type form, local method invocation form, distinct form.1. Simple usage:This example returns a sequence that contains only the name of the customer contact person.var q =From C in DB. CustomersSelect C.

Label:The data table used in the following example LastName FirstName Address City Year Adams John Oxford Street London 1970 Bush George Fifth Avenue New York 1975 Carter Thomas Changan Street Beijing 1980 Gates Bill Xuanwumen 10 Beijing 1985 SELECT