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• what is the use of view in sql server?

  - by Surya sasidhar

  hi, i have a doubt what is a view. where should we use and what is the use of view. is there any good reference for views. thank you

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• SQL grouping query question; evaluating a group of rows based on the value of one field.

  - by user324575

  I've got table vendorparts that lists all my parts and their vendor(s). Parts with multiple vendors have multiple records in this table. I'm trying to write a query that only returns the partid, and vendor of parts that do not have a default vendor assigned. Partid Vendor Defaultflag 1 A 1 2 B 0 2 C 0 3 D 0 3 E 0 3 F 1 4 G 0 I would like to return the following: Partid Vendor 2 A 2 B 4 G I'm obviously having issues with partid 3 and getting the query to see it as having a default vendor assigned.

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• Which method is best method for speed? in SQL Server, stored procedure

  - by AjmeraInfo

  I have select, insert, update and delete query. If I have to write all queries in the same stored procedure that is good for performance or should I write all queries in separate stored procedures?

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• Why would SQL be very slow when doing updates?

  - by ooo

  Suddenly doing updates into a few tables have gotten 10 times slower than they used to be. What are some good recommendations to determine root cause and optimization? Could it be that indexing certain columns are causing updates to be slow? Any other recommendations? I guess more important than guesses would be help on the process of identifying the root cause or metrics around performance. Is there anything in Fluent NHibernate that you can use to help identify the root cause of performance issues?

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• How to query by recent date and value in SQL?

  - by wsb3383

  I have a table with three columns: patient_id, obs_date, and weight_val. patient_id stores patient identification #, weight_val stores a weight value, and obs_date stores the date when the weight reading was taken. So, a patient can have many different weight readings at different dates. How do you write a query for: select all patients whose last weight reading is 120?

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• How to select distinct in SQl Server 2008 but for only one field out of many?

  - by bakerjr

  I have a query: SELECT Content.content_name, Language2.Name, Language2.language_id, Content.id, Content.content_description, FROM Language AS Language2 LEFT JOIN contents AS Content ON (Language2.language_id = Content.language_id) How do I select only the distinct content_name?

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• [MS Access 2003 SQL] Switch is causing #error, why and how can I fix it...

  - by Chris

  I have 3 fields in my table: start, end (dates) and length (number, might be blank). My Aim is to calculate an end date using start and length where end doesn't exist... I have: SELECT Switch((g.length<>0) And IsDate(g.end),DateAdd("m",g.length,g.start)) AS field FROM table g If there is no start, end or length, Access displays blank - this is fine. If there is no end, but start and length are ok, the calculated date is shown - again fine. BUT If there is no end, or length, but a start exists, access displays #Error I don't understand why, and can't fix it, please help!

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• which sql query is more efficient: select count(*) or select ... where key>value?

  - by davka

  I need to periodically update a local cache with new additions to some DB table. The table rows contain an auto-increment sequential number (SN) field. The cache keeps this number too, so basically I just need to fetch all rows with SN larger than the highest I already have. SELECT * FROM table where SN > <max_cached_SN> However, the majority of the attempts will bring no data (I just need to make sure that I have an absolutely up-to-date local copy). So I wander if this will be more efficient: count = SELECT count(*) from table; if (count > <cache_size>) // fetch new rows as above I suppose that selecting by an indexed numeric field is quite efficient, so I wander whether using count has benefit. On the other hand, this test/update will be done quite frequently and by many clients, so there is a motivation to optimize it.

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• How to select the last record from MySQL table using SQl syntax.

  - by Vafello

  I have a table with several records. There is an id field. I would like to select the record with the most recent id (i.e. the ighest id). Any ideas?

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• Copy huge tables data from one database to another in SQL Server.

  - by Narasimhulu

  I have two database say DB_A and DB_B. In DB_A database, table having huge data (few tables are having 2 to 10 million data). I want to move the all table data from DB_A to DB_B database. Please help me on writing stored procedures to move efficiently (fast) the data from one database to another.

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• How do I remove database name from SQL Server generated script?

  - by bucha

  Anytime I use 'script table as' - 'Insert To' (or other command), the script generated automatically places the database name in the script. Such as: INSERT INTO [DatabaseName].[dbo].[tblToBeInserted] ... While not a huge problem to just delete it, it has slipped by a few times and the script breaks if run on a different server with a different database name but has the same schema. (Such as running on [DatabaseName.Test]) Is there an option I can change, or can I modify the output in any way to remove this?

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• [MYSQL] select statement that combines similar rows with certain ids ?

  - by vegatron

  hi I have a warehouse_products table which defines how many products in the warehouses so lets say I have 20 records/rows in the table, some rows may contain the same product id but in a different warehouse I need to create select statement that give every product one row, and in this row I must have the quantity in warehouse A and warehouse B .. so in the end I will get for example 10 rows that contain all the data id domain_id warehouse_id wh_product_id quantity 2 1 2 2 84 3 1 1 3 221 4 1 3 3 0 5 1 1 3 14 6 1 1 2 73 7 1 1 1 123

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• Can you define values in a SQL statement that you can join/union, but are not stored in a table outs

  - by Mervyn

  I'm trying to create a query and need to join against something that I can define values in without creating a table. I'll attempt to describe what I'm trying to do: table1 is joined on field a with table2 (titles for FK in table 1) - Table1 has values outside of what exists in table2 - I want to add an additional 'table' to be unioned with table2 and then joined with table 1 Thanks

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• SQL query to get lowest 2 values of a counted query selection (using db2)?

  - by jNoob

  Hi, Imagine I already have a query that returns the following: Col1 | Col2 ------------ A | 2 B | 3 C | 3 D | 4 E | 8 ... Say I used something like this: select Col1, count ( * ) as Col2 \ from ... where ... order by Col2 \ group by Col1 \ So now, all I want to select are (Col1, Col2) such that it returns the selections (a, b) and (c, d) where (b >= all (Col2)) and (d >= ((all (Col2)) - a)). So for the above example, it would return {(A, 2), (B, 3), (C, 3)}. How do I go about doing this? Any help would be highly appreciated. Thanks.

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• [Linq to sql] query result what should i use Count() or Any()...

  - by Pandiya Chendur

  I am checking login of a user by this repository method, public bool getLoginStatus(string emailId, string password) { var query = from r in taxidb.Registrations where (r.EmailId == emailId && r.Password==password) select r; if (query.Count() != 0) { return true; } return false; } I saw in one of the previous questions !query.Any() would be faster... Which should i use? Any suggestion....

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• Is there a way to convert a Non-Clustered Index on a Primary Key to a Clustered one? (sql-server 200

  - by Lieven Cardoen

  With Management Studio I can't alter the index. Dropping it doesn't work because it's being used as a foreign key in a lot of other tables. Can I somehow alter it? Or how would you do this?

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• Is the available disk space stored in the sql server (2000) master database?

  - by cindi

  I want to be able to monitor the space left on drives that various databases sit on.

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• SQL Reporting Services 2005 - Date field based on a user entered date?

  - by Pierce

  Hi, I have a report in report services 2005 that has two date fields. The problem is that if users run this for a large section of time it uses too much resources on our server. It is possible to only allow the end user to enter the start date and then the end date be auto populated/derived from this field (for example they enter the 1st of a month and this automatically change the end date to the last of a month.)

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• PHP SQL, SELECT corresponding data from 3 tables at once?

  - by user346325

  I have 3 tables, 'u' 'd' 's' 'u' has userid divid 'd' has divid divname 's' has sname primaryuserid secondaryuserid Now what I'd like to do is display a table with rows of the following format userid, divname, sname Plus figure out a way to decipher whether userid is a primary or secondary for this sname table. I'm able to show userid and divname using a left join, but I don't know how I would add a third table? To make it trickier, there can be more than 1 snames for each userid, up to ~20. Is there a way to display 0-20 snames depending on the userid, seperated with commas?

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• what could be a suitable datatype for storing telephone numbers in sql server 2005?

  - by Mac

  There are various datatypes from which i can choose for example varchar or bigint or decimal or money but which one could be the best in all respect.

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• sql 2008 query. I am trying to correct this error message

  - by getbruce

  What is wrong with this code? What would be the correct syntax? SELECT EmployeeID, SUM('More than 2 orders') FROM Orders WHERE EmployeeID 2 GROUP BY EmployeeID Msg 8117, Level 16, State 1, Line 1 Operand data type varchar is invalid for sum operator.

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• What is the best way to truncate a date in SQL Server?

  - by John Gietzen

  If I have a date value like 2010-03-01 17:34:12.018 What is the most efficient way to turn this into 2010-03-01 00:00:00.000?

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• In sql server is there a way to uniquely identify a database?

  - by s_rajasekar

  Is there any way to uniquely identify a database. If we were to copy a database to another machine, this instance is assumed to be different. i checked on master tables, but could not identify any information that can identify this.

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• [Linq-To-Sql]How to return two values of different datatypes?

  - by Pandiya Chendur

  Here is my repository method which returns UserId , public IQueryable<int> getLoginStatus(string emailId, string password) { return (from r in taxidb.Registrations where (r.EmailId == emailId && r.Password == password) select r.UserId); } How to return UserName which is a string along with UserId... Any suggestion?

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• How to check group for containing certain elements in SQL?

  - by noxvile

  I have a simple table: id num 1 7 1 5 1 4 2 5 2 4 2 7 3 4 3 7 How to select ids having num 5 as well as 7 and 4 For this example ids: 2, 3

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