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

Posted on 2016-07-20
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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')

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Question by:amucinobluedot
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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.
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Author Comment

by:amucinobluedot
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'"
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LVL 69

Accepted Solution

by:
Éric Moreau earned 500 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)

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Author Closing Comment

by:amucinobluedot
ID: 41723062
Thx!
0
 

Author Comment

by:amucinobluedot
ID: 41723065
Where can I add a 'where' clause of the row data ... like
'where usertype = 'contact'  ?
0
 
LVL 69

Expert Comment

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

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

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Author Comment

by:amucinobluedot
ID: 41723158
Perfect. Thank you !!
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