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ms sql count distinct multiple columns知識摘要

(共計:20)
  • Oracle (PL/SQL) Equivalents for MS SQL Server (T-SQL) Constructs | John Opincar's Blue Corner
    Trakal Says: September 11, 2007 at 4:12 am Hello, I don’t write the comment for this article but i just want to know a function of SQL Server for Oracle. for exemple, CREATE PROCEDURE [dbo].[test] ( @username[nvarchar] (64) = NULL) AS IF@username IS NULL

  • Rolling up multiple rows into a single row and column for SQL Server data
    STUFF() Function Before going to the examples, we need to understand the workings of the commands mentioned above. The STUFF() function puts a string in another string, from an initial position. With this we can insert, replace or remove one or more chara

  • group by - COUNT(DISTINCT) in multiple columns in SQL Server 2008 - Stack Overflow
    In Oracle, it's possible to get a count of distinct values in multiple columns by using the || operator (according to this forum post, anyway): SELECT COUNT(DISTINCT ColumnA || ColumnB) FROM MyTable Is there a way to do this in SQL Server 2008? I'm trying

  • sql - Counting DISTINCT over multiple columns - Stack Overflow
    What is it about your existing query that you don't like? If you are concerned that DISTINCT across two columns does not return just the unique permutations why not try it? It certainly works as you might expect in Oracle. SQL> select distinct deptno, job

  • How to count distinct records in MS Access
    2 records returned. Count distinct records that contain NULL values The query below is the inner query we just saw which shows a list of distinct values in the ReportsTo column. Note that when we run this query alone, NULL is displayed in the result set,

  • Oracle SQL: displaying multiple columns per row
    Until 11g, Oracle SQL did not have a direct mechanism for allowing multiple values from the same column to be displayed in the same row of output. SQL is designed not to disallow repeating values on a single line of output, but Oracle has several tricks f

  • sql - Running total with count? - Database Administrators Stack Exchange
    As the title suggests I need some help getting a running total in T-SQL. The problem is that the sum I need to do is the sum of a count: sum(count (distinct (customers))) Say if I ...

  • MS SQL Series — DatabaseJournal.com - Database Journal Daily Database Management & Administration
    The Database Journal Series index is a listing of articles, which contain more than three installments. It is categorized by database, author name, series title and article title. MS SQL Oracle DB2 MS Access MySQL Michael Aubert Learn SQL Server 2000 ...

  • SQL
    SQL, MSSQL, MS SQL SQL Server, SQL Server 2000, SQL Server 2005, SQL Server 2008, Microsoft SQL Server ... if you are experiencing performance issues for your queries than it may be due to outdated statistics. An outdated statistic can make the sql server

  • MS-SQL Functional DBA | Manikandan Rajagopalan
    Index optimization is one of the most important task for every DBA. We need to follow the below mentioned checklist to optimize the Index in very easy manner. Create Index on frequently used columns in T-SQL Code. Columns used in WHERE, ORDER BY and ...

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