Questions tagged [sql-server]
Microsoft SQL Server is a relational database management system (RDBMS). Use this tag for all Microsoft SQL Server editions including Compact, Express, Azure, Fast-track, APS (formerly PDW) and Azure SQL DW. Do not use this tag for other types of DBMS (MySQL, PostgreSQL, Oracle, etc.). Do not use this tag for issues on software and mobile development, unless it is directly related to the database.
sql-server
26,645
questions
781
votes
19
answers
1.0m
views
Get top 1 row of each group
I have a table which I want to get the latest entry for each group. Here's the table:
DocumentStatusLogs Table
ID
DocumentID
Status
DateCreated
2
1
S1
7/29/2011
3
1
S2
7/30/2011
6
1
S1
8/02/2011
...
- 29.9k
376
votes
12
answers
194k
views
Simulating group_concat MySQL function in Microsoft SQL Server 2005?
I'm trying to migrate a MySQL-based app over to Microsoft SQL Server 2005 (not by choice, but that's life).
In the original app, we used almost entirely ANSI-SQL compliant statements, with one ...
- 7,137
261
votes
9
answers
351k
views
SQL Server dynamic PIVOT query?
I've been tasked with coming up with a means of translating the following data:
date category amount
1/1/2012 ABC 1000.00
2/1/2012 DEF 500.00
2/1/2012 ...
- 3,076
2426
votes
48
answers
3.3m
views
How to concatenate text from multiple rows into a single text string in SQL Server
Consider a database table holding names, with three rows:
Peter
Paul
Mary
Is there an easy way to turn this into a single string of Peter, Paul, Mary?
- 29.3k
330
votes
7
answers
163k
views
How can you represent inheritance in a database? [closed]
I'm thinking about how to represent a complex structure in a SQL Server database.
Consider an application that needs to store details of a family of objects, which share some attributes, but have ...
- 3,505
497
votes
4
answers
1.5m
views
Efficiently convert rows to columns in sql server
I'm looking for an efficient way to convert rows to columns in SQL server, I heard that PIVOT is not very fast, and I need to deal with lot of records.
This is my example:
Id
Value
ColumnName
1
John
...
- 5,013
131
votes
7
answers
161k
views
Why do we always prefer using parameters in SQL statements?
I am very new to working with databases. Now I can write SELECT, UPDATE, DELETE, and INSERT commands. But I have seen many forums where we prefer to write:
SELECT empSalary from employee where salary ...
- 11.6k
533
votes
46
answers
965k
views
How do I split a delimited string so I can access individual items?
Using SQL Server, how do I split a string so I can access item x?
Take a string "Hello John Smith". How can I split the string by space and access the item at index 1 which should return "John"?
- 75.3k
339
votes
9
answers
1.1m
views
Convert Rows to columns using 'Pivot' in SQL Server
I have read the stuff on MS pivot tables and I am still having problems getting this correct.
I have a temp table that is being created, we will say that column 1 is a Store number, and column 2 is a ...
- 3,640
534
votes
58
answers
2.6m
views
Cannot Connect to Server - A network-related or instance-specific error
I get the following error when trying to connect to SQL Server:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was ...
- 5,535
1374
votes
43
answers
1.4m
views
How can I remove duplicate rows?
I need to remove duplicate rows from a fairly large SQL Server table (i.e. 300,000+ rows).
The rows, of course, will not be perfect duplicates because of the existence of the RowID identity field.
...
- 69.8k
338
votes
18
answers
742k
views
Turning a Comma Separated string into individual rows
I have a SQL Table like this:
SomeID
OtherID
Data
abcdef-.....
cdef123-...
18,20,22
abcdef-.....
4554a24-...
17,19
987654-.....
12324a2-...
13,19,20
Is there a query where I can perform a query ...
- 180k
192
votes
27
answers
680k
views
T-SQL split string
I have a SQL Server 2008 R2 column containing a string which I need to split by a comma. I have seen many answers on StackOverflow but none of them works in R2. I have made sure I have select ...
- 2,167
4285
votes
40
answers
5.4m
views
How do I UPDATE from a SELECT in SQL Server?
In SQL Server, it is possible to insert rows into a table with an INSERT.. SELECT statement:
INSERT INTO Table (col1, col2, col3)
SELECT col1, col2, col3
FROM other_table
WHERE sql = 'cool'
Is it ...
- 45.1k
315
votes
4
answers
105k
views
What makes a SQL statement sargable?
By definition (at least from what I've seen) sargable means that a query is capable of having the query engine optimize the execution plan that the query uses. I've tried looking up the answers, but ...
- 20.1k