Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Query sql table to display column, data type, lenght and value

Posted on 2016-07-20
7
Medium Priority
?
108 Views
Last Modified: 2016-07-21
Is there a way to run a query on a table so it returns the column name, data type, lenght and value of first row ?

firmid |  int | 4  |  3
Name | nvarchar |  30  |   Lopez

To end up with something like that.

The query below gives me pretty much all I need minus the first record values.

SELECT 
    c.name 'Column Name',
    t.Name 'Data type',
    c.max_length 'Max Length',
    c.precision ,
    c.scale ,
    c.is_nullable,
    ISNULL(i.is_primary_key, 0) 'Primary Key'
FROM    
    sys.columns c
INNER JOIN 
    sys.types t ON c.user_type_id = t.user_type_id
LEFT OUTER JOIN 
    sys.index_columns ic ON ic.object_id = c.object_id AND ic.column_id = c.column_id
LEFT OUTER JOIN 
    sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id
WHERE
    c.object_id = OBJECT_ID('LawFirm')

Open in new window

0
Comment
Question by:Aleks
  • 4
  • 2
7 Comments
 
LVL 27

Expert Comment

by:tliotta
ID: 41722221
Do you need it for a specific table or is it intended to be used against different unknown tables?
...and value of first row ?
What do you mean by the value of a row? Rows don't have values; columns have values. Do you want the value of each column from the first row?

How are you defining "first row"? Depending on an ORDER BY clause, different rows might be the "first row". Of course, without an ORDER BY clause, the first row can't be guaranteed.
0
 

Author Comment

by:Aleks
ID: 41722975
I should have said
the value of each column from the first row
and I may add some 'where' caluse to it like "Where usertype = 'contact'"
0
 
LVL 70

Accepted Solution

by:
Éric Moreau earned 2000 total points
ID: 41723048
Nice puzzle this morning!

I have been able to achieve what you want by using a dynamic query:
DECLARE @tableName varchar(10)
SET @tableName = 'Fund'

DECLARE curFields CURSOR FOR
	SELECT 
		c.name AS ColumnName,
		t.Name AS DataType,
		c.max_length AS MaxLength,
		c.precision ,
		c.scale ,
		c.is_nullable,
		ISNULL(i.is_primary_key, 0) AS PrimaryKey
	FROM sys.columns c
	INNER JOIN sys.types t ON c.user_type_id = t.user_type_id
	LEFT JOIN sys.index_columns ic ON ic.object_id = c.object_id AND ic.column_id = c.column_id
	LEFT JOIN sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id
	WHERE c.object_id = OBJECT_ID(@tableName)

DECLARE @ColumnName VARCHAR(100)
DECLARE @DataType VARCHAR(100)
DECLARE @MaxLength INT
DECLARE @Precision INT
DECLARE @Scale INT
DECLARE @IsNullable INT
DECLARE @PrimayKey INT 

OPEN curFields
FETCH NEXT FROM curFields INTO @ColumnName, @DataType, @MaxLength, @Precision, @Scale, @IsNullable, @PrimayKey

DECLARE @sql NVARCHAR(max)
SET @sql = ''

WHILE @@FETCH_STATUS = 0
BEGIN
	SET @sql = @sql + CASE WHEN @sql = '' THEN '' ELSE ' UNION ALL 
' END 
+ 'select ''' + @ColumnName + ''' as ColumnName, ''' + @DataType + ''' as DataType, ''' + CAST(@MaxLength AS VARCHAR) + ''' as MaxLength, ''' + CAST(@Precision AS VARCHAR) + ''' as Precision, ''' + CAST(@Scale AS VARCHAR) + ''' as Scale, ''' + CAST(@IsNullable AS VARCHAR) + ''' as IsNullable, ''' + CAST(@PrimayKey AS VARCHAR) + ''' as PrimayKey, (SELECT TOP 1 cast(' + @ColumnName + ' as varchar(max)) FROM ' + @tableName + ') '

	FETCH NEXT FROM curFields INTO @ColumnName, @DataType, @MaxLength, @Precision, @Scale, @IsNullable, @PrimayKey
END 

CLOSE curFields
DEALLOCATE curFields

print @sql 
EXEC (@sql)

Open in new window

0
NFR key for Veeam Agent for Linux

Veeam is happy to provide a free NFR license for one year.  It allows for the non‑production use and valid for five workstations and two servers. Veeam Agent for Linux is a simple backup tool for your Linux installations, both on‑premises and in the public cloud.

 

Author Closing Comment

by:Aleks
ID: 41723062
Thx!
0
 

Author Comment

by:Aleks
ID: 41723065
Where can I add a 'where' clause of the row data ... like
'where usertype = 'contact'  ?
0
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 41723091
would be in the FROM clause:

FROM ' + @tableName + ' where usertype = ''contact'') '

Open in new window

0
 

Author Comment

by:Aleks
ID: 41723158
Perfect. Thank you !!
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When trying to connect from SSMS v17.x to a SQL Server Integration Services 2016 instance or previous version, you get the error “Connecting to the Integration Services service on the computer failed with the following error: 'The specified service …
One of the most important things in an application is the query performance. This article intends to give you good tips to improve the performance of your queries.
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
Suggested Courses

581 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question