SQLã§CASEå¼ã®æ¸ãæ¹ãä½¿ãæ¹ãSQLã®ãµã³ãã«ããæ¢ãã§ã¯ããã¾ãããï¼ æ¬è¨äºã§ã¯ãCASEå¼ã使ã£ãæ¡ä»¶åå²ãåã®å¤ã®ç½®æãªã©ã®SQLãµã³ãã«ãç´¹ä»ãã¦ãã¾ãããã²åèã«ãã¦ãã ⦠insert into product values(6, 'Mouse', 'White'); ããã§ã¯ DISTINCT ãæå®ããã¨ã©ã®ããã«å¤ããã®ãã確èªãã¦ã¿ã¾ããæåã« product ãã¼ãã«ã® name ã«ã©ã ã®å¤ãéè¤ãããã®ãå«ãã¦åå¾ãã¦ã¿ã¾ãã, 次㫠DISTINCT ãã¼ã¯ã¼ããæå®ã㦠product ãã¼ãã«ã® name ã«ã©ã ã®å¤ãåå¾ãã¦ã¿ã¾ãã, name ã«ã©ã ã®å¤ã®ä¸ã§éè¤ããå¤ãåãé¤ãããã¼ã¿ãåå¾ãããã¨ãã§ãã¾ããã, 次ã«åãããã« product ãã¼ãã«ã® color ã«ã©ã ã®å¤ã DISTINCT ãã¼ã¯ã¼ããæå®ããå ´åã¨ããªãã£ãå ´åã§ããããåå¾ãã¦ã¿ã¾ãã, DISTINCT ãæå®ãããã¨ã§ color ã«ã©ã ã®å¤ã®ä¸ã§éè¤ããå¤ãåãé¤ãããã¼ã¿ãåå¾ãããã¨ãã§ãã¾ããã, è¤æ°ã®ã«ã©ã ã対象ã«éè¤ãã¼ã¿ãé¤å¤ããå ´åã¯ãè¤æ°ã®ã«ã©ã ã®å¤ã®çµã¿åãããä¸è´ãããã¼ã¿ãé¤å¤ãã¾ããä¾ãã°å
ã»ã©ä½¿ç¨ãã product ãã¼ãã«ã§ name ã«ã©ã 㨠color ã«ã©ã ã®ãã¼ã¿ãåå¾ããæã«éè¤ãããã¼ã¿ãé¤å¤ãã¦åå¾ããå ´åã¯æ¬¡ã®ããã«è¨è¿°ãã¾ãã. You are not guaranteed to get one row back, so CASE won't be able to evaluate a response. DISTINCTã®æ¦è¦ããã³ä½¿ç¨ä¾ SELECTæã«ããã¦ãSELECTã¨ã«ã©ã æå®ã®éã«DISTINCTã¨è¨è¿°ãããã¨ã§ãéè¤è¡ãåé¤ãã¦ãã¼ã¿ãæ½åºãããã¨ãã§ãã¾ããNULLãæ£ããè¡ã ⦠select distinct name from product; name ã«ã©ã ã®å¤ã®ä¸ã§éè¤ããå¤ãåãé¤ãããã¼ã¿ãåå¾ãããã¨ãã§ãã¾ããã æ¬¡ã«åãããã« product ãã¼ãã«ã® color ã«ã©ã ã®å¤ã DISTINCT ãã¼ã¯ã¼ããæå®ããå ´åã¨ããªãã£ãå ´åã§ããããåå¾ãã¦ã¿ã¾ãã 第22回.条件分岐(Select Case) ExcelマクロVBAの基本と応用、エクセルVBAの初級・初心者向け解説 最終更新日:2020-09-26 第22回.条件分岐(Select Case) 前回のElseIf以外に、多肢条件分岐の別の書き … DISTINCTã§è¤æ°åã®éè¤è¡ãé¤å¤ã«ãããã¿ã¼ã³--使1,使2ãåå¾ SELECT ADDRESS1,ADDRESS2 FROM EMP; In this syntax, the combination of values in the column_1, column_2, and column_3 are used to determine the uniqueness of the data.The DISTINCT clause can be used only in the SELECT statement.Note that DISTINCT is synonym of UNIQUE which … CREATE TABLE Test.dbo.contact (FirstName nvarchar(50)) GO INSERT INTO Test.dbo.contact SELECT FirstName FROM Person.Contact GO SELECT DISTINCT TOP 10 FirstName FROM Test.dbo.contact WHERE FirstName When we run the SELECT query you can see that the output combines both "Adam" and "ADAM" since case is ingored. The SELECT DISTINCT statement is used to return only distinct (different) values. DISTINCT does not work at that level. ããã§ã¯éè¤æé¤ã®ããã®æ
å ±ãè½ã¡ã¦ãã¾ã£ã¦ãã¾ãã. If you want to get non-selected columns' value, it's useless to use SELECT DISTINCT. Here’s the code that can be used: select city, count (distinct case when vip then customer else null end) as VIPs, count (distinct case when not vip then customer else null end) as Not_VIPs from table group by city The COUNT automatically ignores the null values, so it’s only count the number of distinct cities that are/are not VIPs. ãSELECT DISTINCT ID, NAME FROM Table1ã㨠ãSELECT DISTINCT ID FROM Table1ãã¨ã§ã¯ã æ½åºããããã¼ã¿ä»¶æ°ãç°ãªããã¨ã¯ãçè§£ããã¦ãã¾ãããï¼ ã¤ã¾ããNAMEãå«ããã¨çµæãç°ãªã£ã¦ãã¾ãããã§ãã NAMEã DISTINCT ã使ã£ãéè¤ãã¼ã¿ã®é¤å¤, è¤æ°ã®ã«ã©ã ã対象ã«éè¤ãã¼ã¿ãé¤å¤ãã. insert into product values(4, 'NotePC', 'Black'); SELECT DISTINCT ã«ã©ã å, ... FROM ãã¼ãã«å; éè¤ãã¦ãããã©ããã®å¤æã¯ãã¼ã¿å
¨ä½ãä¸è´ãã¦ãããã©ããã§ã¯ãªãããã¼ã¿ã®ä¸ã§ SELECT æã§åå¾ããã«ã©ã ã®å¤ãä¸è´ãã¦ãããã¼ã¿ã対象ã¨ãªãã¾ããã«ã©ã ã1ã¤ã§ããã°ãã®ã«ã©ã ã®å¤ãåããã¼ã¿ãè¤æ°ã®ã«ã©ã ã®å¤ãåå¾ãã¦ããå ´åã¯ãã®å¤ã®çµã¿åãããå
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¨ã¦åå¾ããå ´åã«ã¯ ALL ãã¼ã¯ã¼ããæå®ãã¾ããæ¸å¼ã¯æ¬¡ã®éãã§ãã. DISTINCT does not work at that level. Example : SELECT with DISTINCT on all columns of the first query To get the identical rows (on four columns agent_code, ord_amount, cust_code, and ord_num ) once from the orders table , the following SQL statement can be used : Indeed, in some case, grouping by columns combination , some other columns' values are needed . count(distinct) Athenaãå©ç¨ãã¦ããã®ã§ãèªã¿è¾¼ããã¼ã¿éãæ¸ãããããã¯ã¨ãªãå®è¡ããå¯¾è±¡ã¯æ¸ããããããªã®ã§1åã®ã¯ã¨ãªå®è¡ã§å¿
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å ±ãå¾ãããè¤æ°ã®æ¡ä»¶ã§`count()`ãåå¾ãããããããã¯ä»¥åã®ã¨ã³ããªã§è¿°ã¹ãéãã insert into product values(1, 'Mouse', 'White'); SELECT句でSELECTのあとにDISTINCTを指定すると、重複した列は1行のみ出力するようになります。 売上NOが1と2と4のデータの売上日はともに20150401なのでDISTINCTを指定しなければ20150401のデータが3行表示されてしまいますが、DISTINCTを指定することにより1行のみ表示されるようになります。 insert into product values(3, 'Mouse', 'Black'); SQL で重複排除をしたいときに DISTINCT と GROUP BY を使う例をみかけます.この2つは何が違うのでしょうか? 準備 検証用に以下のようなテーブルを用意します. mysql> SELECT * … 第22å.æ¡ä»¶åå²ï¼Select Caseï¼ Excelãã¯ãVBAã®åºæ¬ã¨å¿ç¨ãã¨ã¯ã»ã«VBAã®åç´ã»åå¿è
åã解説 æçµæ´æ°æ¥ï¼2020-09-26 第22å.æ¡ä»¶åå²ï¼Select Caseï¼ ååã®ElseIf以å¤ã«ãå¤è¢æ¡ä»¶åå²ã®å¥ã®æ¸ã ⦠Remove DISTINCT from the CASE statement and move it to the SELECT… Here is the query to achieve required result along with the output. DISTINCTと同等の結果を得ることのできるSQL文にEXISTSがあります。例えば, SELECT DISTINCT a.ID1, a.NAME1 FROM TABLE1 a, TABLE2 b WHERE a.ID1 = b.ID2 のSQL文は,副問い合わせの条件としてEXISTSを指定して In other words, it removes the duplicate values in the column from the result set. DISTINCTで複数列の重複行を除外にするパターン--住所1,住所2を取得 SELECT ADDRESS1,ADDRESS2 FROM EMP; Note the usage of ‘distinct’ clause outside of case statement. Indeed, in some case, grouping by columns combination , some other columns' values are needed . CASEæã使ãã¨ããããªãã°â¡â¡ããã§ããã æ¡ä»¶æã«ã¯ããã¤ãã®æ¸ãæ¹ããããåºæ¬ã®å½¢ãä¸å¿ã«è©±ãé²ããã SELECT CASE WHEN æ¡ä»¶1 THEN å¤1 (WHEN æ¡ä»¶2 THEN å¤2) (ELSE å¤3) END FROM `ãã¼ãã«` CASEã®ã«ã¼ã«ã¯ 1. SELECT DISTINCT eliminates duplicated records and returns only distinct/unique columns. é, WSLiWindows Subsystem for Linuxj 2üå@, NEhÅKubernetesðwÔ\\}l[WhT[rXÅnßéKubernetesüå, ue[NªRiãÌj
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[XÜÆß. CASE文で場合分けする CASE文を使うと「〇〇ならば 」ができる。 条件文にはいくつかの書き方があるが基本の形を中心に話を進める。 SELECT CASE WHEN 条件1 THEN 値1 (WHEN 条件2 THEN 値2) (ELSE 値3) END FROM `テーブル` select distinctOENT.OTHER_EXTERNAL_ID AS AGENT_NUMBER,CASE WHEN SE.Organization_Name IS NULL OR RTRIM(LTRIM(SE.ORGANIZATION_NAME)) = '' THEN '' ELSE upper( SE.ORGANIZATION_NAME )END AS AGENTFROM SomeTableNameorder by AGENT_NUMBER. CREATE TABLE Test.dbo.contact (FirstName nvarchar(50)) GO INSERT INTO Test.dbo.contact SELECT FirstName FROM Person.Contact GO SELECT DISTINCT TOP 10 FirstName FROM Test.dbo.contact WHERE FirstName When we run the SELECT query you can see that the output combines both "Adam" and "ADAM" since case is ingored. CASEではワイルドカードにも対応しています。このように、あいまい検索もできます。 例5. ELSEã¯ç¡ãã¦ããã¾ããªããELSEããã£ã¦WHENã®ã©ã®æ¡ä»¶ã«ãå½ â¦ ååã®åã«ãDISTINCTããã¤ãããã¨ã«ãããéè¤ãã使ãé¤å¤ãã¦åå¾ãããã¨ãã§ãã¾ããã ä¾2. DBOnline ©2006-2019 Buzzword Inc.. All Rights Reserved. SQL ã§éè¤æé¤ããããã¨ãã« DISTINCT 㨠GROUP BY ã使ãä¾ãã¿ããã¾ãï¼ãã®2ã¤ã¯ä½ãéãã®ã§ããããï¼ æºå æ¤è¨¼ç¨ã«ä»¥ä¸ã®ãããªãã¼ãã«ãç¨æãã¾ãï¼ mysql> SELECT * ⦠Here is the query to achieve required result along with the output. SQL DISTINCT文で重複データをカウントせずに集計する 「社員マスタ」と「売上明細」と「会社マスタ」というテーブルがあります。売上明細テーブルには、社員の売上情報が格納されています。「売上明細」は「会社コード」のカラムを持ち、どこの会社(取引先)からの売上か、という情 … WHEREå¥ã使ãã°åãäºãå®ç¾åºæ¥ã¾ãããSELECTæã§ä¸è¨ã®ã«ã¦ã³ããè¡ãããå ´åã«æå¹ã§ãã. create table product(id integer, name text, color text); INSERT æã使ã£ã¦ãã¼ãã«ã«ãã¼ã¿ãããã¤ãæ ¼ç´ãã¦ããã¾ãã. distinct is not a function. CASE 集計パターン--CASEで男女の数をSELECT SELECT SUM(CASE WHEN gender = '男' THEN 1 ELSE 0 END) boy, SUM(CASE WHEN It's applied on all the columns selected and produces unique combination of all the selected columns. Suppose you are asked to group values by ID and then calculate sum of distinct values of y when x < 30. If you want to get non-selected columns' value, it's useless to use SELECT DISTINCT. Oracle SELECTæã®CASEå¥ã®ä½¿ãæ¹ã説æãã¾ããDECODE颿°ã使ããããæè»ã«å¦çãè¨è¿°ã§ãã¾ããCASEå¼ã®æ§æã®èª¬æãåç´CASEå¼ã®ä¾ãæ¤ç´¢CASEå¼ã®ä¾ã SELECT SUM(CASE WHEN table.column >= 1 AND table.column <= 10 THEN 1 ELSE 0 END) FROM table. DISTINCTã¨ã¯ DISTINCTã¨ã¯ãSELECTæã®å®è¡çµæã®éè¤ã¬ã³ã¼ã(ãã¼ã¿è¡)ã1ã¤ã«ã¾ã¨ããããã®ä¾¿å©ãªæ§æã§ãã ä¾ãã°ã徿¥å¡ãã¼ãã«ã«ãå§ãåãã®é
ç®ãããã¨ãã¦ãåå§ååãè¤æ°è¡ããå ´åã«DISTINCTã使ãã¨æ¬¡ã®ããã« 列名の前に「DISTINCT」をつけることにより、重複した住所を除外して取得することができました。 例2. select distinct name, color from product order by name; name ã«ã©ã 㨠color ã«ã©ã ã®å¤ã®çµã¿åãããåããã¼ã¿ãé¤å¤ãã¦ãã¼ã¿ãåå¾ãããã¨ãã§ãã¾ããã ãã®ããã«è¤æ°ã®ã«ã©ã ã®å¤ãåå¾ãã¦ããå ´åã¯ãname ã«ã©ã ã color ã«ã©ã ã ãã¿ããéè¤ãã¦ãããã¼ã¿ãããã¾ãã CASEã§å§ã¾ãENDã§çµããï¼å¿
é ï¼ 2. ãWHEN æ¡ä»¶ THEN å¤ãã§ããã®æ¡ä»¶ãæºããããæå®ããå¤ãã¨ãã 3. è¤æ°æ¡ä»¶ã¯ãWHEN æ¡ä»¶ THEN å¤ããå¿
è¦ãªã ãæ¸ããæåã«æ¡ä»¶ãæºãããå¤ãé©ç¨ããã 4. insert into product values(5, 'Display', 'Yellow'); select distinct name, color from product order by name; name カラムと color カラムの値の組み合わせが同じデータを除外してデータを取得することができました。 このように複数のカラムの値を取得している場合は、name カラムや color カラムだけみたら重複しているデータもあります。 select distinct name, color from product; ããããã®ã«ã©ã ã®å¤ã ãã§ããã°åãå¤ããããã¼ã¿ãããã®ã§ããã2ã¤ã®ã«ã©ã ã®å¤ãã©ã¡ããåããã¼ã¿ã¯é¤å¤ããã¦ãã¾ãã, DISTINCT ãæå®ãããã¨ã§éè¤ãããã¼ã¿ãé¤å¤ãã¦ãã¼ã¿ãåå¾ããæ¹æ³ã«ã¤ãã¦è§£èª¬ãã¾ããã, åå¿è
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ã®æ¹ã対象ã¨ããããã°ã©ãã³ã°æ¹æ³ãéçºç°å¢ã®æ§ç¯ã®è§£èª¬ãè¡ããµã¤ãã®éå¶ãè¡ã£ã¦ãã¾ãã. count(distinct) Athenaを利用しているので、読み込むデータ量も減らしたいしクエリを実行する対象は減らしたい。なので1回のクエリ実行で必要な情報を得たい。複数の条件で`count()`を取得したいが、これは以前のエントリで述べた通り。 ä»åã¯ãSELECTæãå
¥ãåã«ããå¯åãåããï¼ãµãã¯ã¨ãªã¼ï¼ã説æãã¾ãã ã¾ãã¯ãæ¬è¬åº§ã®ç¬¬1åï¼ãSQLã®åºç¤SELECTæãè¦ããããï¼ã§è§£èª¬ãããINããããä¸åº¦å¾©ç¿ãã¾ããããæ¬¡ã®ä¾é¡ãå®è¡ãã¦ã¿ã¦ãã ããã INå¥ã使ç¨ããã¨ãâ ( ) âã®ä¸ã«æå®ãããå¤ãæã¤è¡ã®ã¿ãæ½åºãããçµæã¨ãã¦è¡¨ç¤ºããã¾ããä¾1ã§ã¯ãCustomerIDããALFKIãããANATRãããANTONãã®é¡§å®¢ã®ã¿ãCustomersãã¼ãã«ããæ½åºããã¦è¡¨ç¤ºããã¦ããã®ãåããã¾ãããããã¯ãä¾2ã®ããã«ããã¹ã¦ ⦠insert into product values(2, 'Pen', 'Green'); Find answers to case-when with distinct from the expert community at Experts Exchange Our community of experts have been thoroughly vetted for their expertise and industry experience. caseå¼ã§ç¹å®ã®æ¡ä»¶ã§çµãããIDã®é
åãè¿ããå¾ãCOUNT DISTINCT ãç¨ãããã¨ã§éè¤æé¤ããã«ã¦ã³ããè¡ãã¾ãã. SELECT DISTINCT su più colonne? ãã¼ãã«ãããã¼ã¿ãåå¾ããæãã¾ã£ããåããã¼ã¿ãå«ã¾ãã¦ããå ´åãããã¾ããã DISTINCT ãæå®ããã¨éè¤ãããã¼ã¿ãé¤å¤ããä¸ã§ãã¼ã¿ãåå¾ãããã¨ãã§ãã¾ããããã§ã¯ DISTINCT ã使ã£ã¦éè¤ãããã¼ã¿ãé¤å¤ããæ¹æ³ã«ã¤ãã¦è§£èª¬ãã¾ãã, SELECT æã使ã£ã¦ãã¼ã¿ãåå¾ããæã«ãéè¤ãããã¼ã¿ãåãé¤ãã¦ãã¼ã¿ãåå¾ããã«ã¯ DISTINCT ãã¼ã¯ã¼ãã使ç¨ãã¾ããæ¸å¼ã¯æ¬¡ã®éãã§ãã. SELECT oh.cust_id, COUNT(DISTINCT oh.order_no) Total_Orders, COUNT(DISTINCT (CASE WHEN DISTINCTã¨åçã®çµæãå¾ããã¨ã®ã§ããSQLæã«EXISTSãããã¾ããä¾ãã°ï¼ SELECT DISTINCT a.ID1, a.NAME1 FROM TABLE1 a, TABLE2 b WHERE a.ID1 = b.ID2 ã®SQLæã¯ï¼å¯åãåããã®æ¡ä»¶ã¨ãã¦EXISTSãæå®ã㦠Remove DISTINCT from the CASE statement and move it to the SELECT⦠It will still return duplicates in case if Agent number differs. Hereâs the code that can be used: select city, count (distinct case when vip then customer else null end) as VIPs, count (distinct case when not vip then customer else null end) as Not_VIPs from table group by city The COUNT automatically ignores the null values, so itâs only count the number of distinct cities that are/are not VIPs. Note the usage of âdistinctâ clause outside of case statement. 「SELECT DISTINCT ID, NAME FROM Table1」と 「SELECT DISTINCT ID FROM Table1」とでは、 抽出されるデータ件数が異なることは、理解されていますよね? つまり、NAMEを含めると結果が異なってしまうわけです。 NAMEを Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values. COUNT DISTINCT 颿°ã¯ã次ã®ä¾ã«ç¤ºãããã«ãåã¾ãã¯å¼ã®ä¸ã®åºæå¤ã®æ°ãæ»ãã¾ãã SELECT COUNT (DISTINCT item_num) FROM items; COUNT DISTINCT 颿°ã«ãã NULL å¤ãæ¤åºãããã¨ãæå®ãããåã®ãã¹ã¦ã®å¤ã NULL ã§ãªãéãããããã¯ç¡è¦ããã¾ãã SELECTå¥ã§SELECTã®ãã¨ã«DISTINCTãæå®ããã¨ãéè¤ããåã¯1è¡ã®ã¿åºåããããã«ãªãã¾ãã 売ä¸NOã1ã¨2ã¨4ã®ãã¼ã¿ã®å£²ä¸æ¥ã¯ã¨ãã«20150401ãªã®ã§DISTINCTãæå®ããªããã°20150401ã®ãã¼ã¿ã3è¡è¡¨ç¤ºããã¦ãã¾ãã¾ãããDISTINCTãæå®ãããã¨ã«ãã1è¡ã®ã¿è¡¨ç¤ºãããããã«ãªãã¾ãã SQL DISTINCTæã§éè¤ãã¼ã¿ãã«ã¦ã³ãããã«éè¨ãã ã社å¡ãã¹ã¿ãã¨ãå£²ä¸æç´°ãã¨ãä¼ç¤¾ãã¹ã¿ãã¨ãããã¼ãã«ãããã¾ããå£²ä¸æç´°ãã¼ãã«ã«ã¯ã社å¡ã®å£²ä¸æ
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⦠To do this, you use the SELECT DISTINCT clause as follows: SELECT DISTINCT column_name FROM table_name; The query returns only distinct values in the specified column. SELECT ALL ã«ã©ã å, ... FROM ãã¼ãã«å; ãã ã DISTINCT ã ALL ãæå®ããªãã£ãå ´å㯠ALL ãè¨è¿°ãããå ´åã¨åãã«ãªãã¾ãã®ã§ãç¹ã«æå®ããå¿
è¦ã¯ããã¾ããã, ã§ã¯å®éã«è©¦ãã¦ã¿ã¾ããæ¬¡ã®ãããªãã¼ãã«ã使ãã¾ããã. SELECT DISTINCT eliminates duplicated records and returns only distinct/unique columns. DISTINCTの概要および使用例 SELECT文において、SELECTとカラム指定の間にDISTINCTと記述することで、重複行を削除してデータを抽出することができます。NULLも正しく行え … select count(*) from ( select distinct COL1, COL2 from TBL ); COUNT(値)よりCOUNT(*)を使うべき ネット上の集計関数COUNTの例では、 COUNT(1)やCOUNT(0) 、 COUNT(ROWID) 、あるいは NOT NULL項目に対してCOUNT(項目) といった使用例が見られる。 If condition is not met, then sum of all values of y. proc sql; select id, sum (distinct y) as sum_unique, coalesce (sum (distinct case when x < 30 then y end),0) +. SELECT oh.cust_id, COUNT(DISTINCT oh.order_no) Total_Orders, COUNT(DISTINCT (CASE WHEN COUNT DISTINCT 関数は、次の例に示すように、列または式の中の固有値の数を戻します。 SELECT COUNT (DISTINCT item_num) FROM items; COUNT DISTINCT 関数により NULL 値が検出されると、指定された列のすべての値が NULL でない限り、これらは無視されます。 You are not guaranteed to get one row back, so CASE won't be able to evaluate a response. In this syntax, the combination of values in the column_1, column_2, and column_3 are used to determine the uniqueness of the data.The DISTINCT clause can be used only in the SELECT statement.Note that DISTINCT is synonym of UNIQUE which ⦠SQLでCASE式の書き方や使い方、SQLのサンプルをお探しではありませんか? 本記事では、CASE式を使った条件分岐や列の値の置換などのSQLサンプルを紹介しています。ぜひ参考にしてくだ … select distinct name from product; name カラムの値の中で重複した値を取り除いたデータを取得することができました。 次に同じように product テーブルの color カラムの値を DISTINCT キーワードを指定した場合としなかった場合でそれぞれ取得してみます。 Nel nostro esempio abbiamo utilizzato il modificatore DISTINCT per identificare i valori differenti presenti all'interno di un unico campo; volendo è anche possibile effettuare questa sintassi per effettuare la selezione di valori distinti all'interno di più campi, tuttavia in simili situazioni è preferibile utilizzare la sintassi offerta da GROUP BY . Want to get non-selected columns ' value, it 's useless to use SELECT DISTINCT column from the result.... 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