sql-server-2008-r2

问题 I'm using SQL Server 2008 R2. I need to compute a percentile value per group, something like: SELECT id, PCTL(0.9, x) -- for the 90th percentile FROM my_table GROUP BY id ORDER BY id For example, given this DDL (fiddle) --- CREATE TABLE my_table (id INT, x REAL); INSERT INTO my_table VALUES (7, 0.164595), (5, 0.671311), (7, 0.0118385), (6, 0.704592), (3, 0.633521), (3, 0.337268), (0, 0.54739), (6, 0.312282), (0, 0.220618), (7, 0.214973), (6, 0.410768), (7, 0.151572), (7, 0.0639506), (5, 0

问题 What is the max size of a file that I can insert using varbinary(max) in SQL Server 2008 R2? I tried to change the max value in the column to more than 8,000 bytes but it won't let me, so I'm guessing the max is 8,000 bytes, but from this article on MSDN, it says that the max storage size is 2^31-1 bytes: varbinary [ ( n | max ) ] Variable-length binary data. n can be a value from 1 through 8,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size is the actual

问题 I created a table in SQL Server like this: CREATE TABLE [UserName] ( [ID] [int] NOT NULL , [Name] [nvarchar] (50) NOT NULL , [Address] [nvarchar] (200) NULL CONSTRAINT [PK_UserName] PRIMARY KEY CLUSTERED ([ID] ASC) ) ON [PRIMARY] GO If I want to make ID an identity column, what do I need? Do I need to drop and create this table and set ID to [ID] [int] IDENTITY(1,1) NOT NULL . By using drop and create, all of data from UserName table are lost . Is there another way to set IDENTITY COLUMN to

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Help with a sql search query using a comma delimitted parameter I want to write a stored procedure that performs a select on a table and need one input variable of type varchar(max) . I'd like to send a bunch of values separated by , as the input parameter, e.g. 'Jack','Jane','Joe' and then get the rows that contain one of these names. In SQL the code would be Select * from Personnel where Name in ('Jack','Joe',

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Help with a sql search query using a comma delimitted parameter I want to write a stored procedure that performs a select on a table and need one input variable of type varchar(max) . I'd like to send a bunch of values separated by , as the input parameter, e.g. 'Jack','Jane','Joe' and then get the rows that contain one of these names. In SQL the code would be Select * from Personnel where Name in ('Jack','Joe',

问题 Scenario : we are fetching rows from SQL Server to C#.Net console application and doing action on the retrieved data from SQL Server through stored procedure; after the action is performed the new data is stored into the MongoDB using C#-MongoDB-Driver. Issue : There are billions of rows. My stored procedure contains query as follows: select * from table_name To work out some batch-wise logic there is no identity column nor any date columns or such. Information : As of now the application is

问题 I'd like to get 4:30 PM of the current day. Hard-coding this way doesn't work: SELECT '07242012 16:30:00.000' This is proving to be more difficult than I thought it would be. How do I approach this? 回答1: SQL Server 2000 / 2005: SELECT DATEADD(MINUTE, 30, DATEADD(HOUR, 16, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP))); -- or SELECT DATEADD(MINUTE, (16*60) + 30, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP)) -- or SELECT CONVERT(DATETIME, CONVERT(CHAR(9), CURRENT_TIMESTAMP, 112) + '16:30'); SQL Server 2008+:

问题 I'd like to get 4:30 PM of the current day. Hard-coding this way doesn't work: SELECT '07242012 16:30:00.000' This is proving to be more difficult than I thought it would be. How do I approach this? 回答1: SQL Server 2000 / 2005: SELECT DATEADD(MINUTE, 30, DATEADD(HOUR, 16, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP))); -- or SELECT DATEADD(MINUTE, (16*60) + 30, DATEDIFF(DAY, 0, CURRENT_TIMESTAMP)) -- or SELECT CONVERT(DATETIME, CONVERT(CHAR(9), CURRENT_TIMESTAMP, 112) + '16:30'); SQL Server 2008+:

问题 I am using SQL Server 2008 R2 and I have an INT column where the data inserted never surpasses the max INT , but I have a query which uses the SUM function which when executed surpasses the max INT limit and throws the error mentioned in the title. I want to be able to execute this query without changing the column type from INT to BIGINT . Here is my query: SELECT UserId, SUM( PokemonExp ) AS TotalExp, MAX( PokemonLevel ) AS MaxPokeLevel FROM mytable GROUP BY UserId ORDER BY TotalExp DESC

问题 I am trying to track down all stored procedures in a database that have never been used, or that have not been used in many months. I would like to find a query to show all the stored procedures that are not in use so that those stored procedures can be analyzed to determine if they can be removed. I am familiar with sys.procedures, but don't know how to determine if a procedure is in use or not. SELECT * FROM sys.procedures; Using SQL Server 2008 R2. UPDATE UPDATE UPDATE Using the query from