Liste toutes les colonnes SQL avec la longueur maximale ET la plus grande longueur

Merci pour les suggestions. J'ai trouvé la solution suivante. Cela me donne les données dont j'ai besoin, mais je serais intéressé de voir si cela peut être rendu plus efficace.

declare @results table
(
ID varchar(36),
TableName varchar(250),
ColumnName varchar(250),
DataType varchar(250),
MaxLength varchar(250),
Longest varchar(250),
SQLText varchar(250)
)

INSERT INTO @results(ID,TableName,ColumnName,DataType,MaxLength,Longest,SQLText)
SELECT 
    NEWID(),
    Object_Name(c.object_id),
    c.name,
    t.Name,
    case 
        when t.Name != 'varchar' Then 'NA'
        when c.max_length = -1 then 'Max' 
        else CAST(c.max_length as varchar)
    end,
    'NA',
    'SELECT Max(Len(' + c.name + ')) FROM ' + OBJECT_SCHEMA_NAME(c.object_id) + '.' + Object_Name(c.object_id)
FROM    
    sys.columns c
INNER JOIN 
    sys.types t ON c.system_type_id = t.system_type_id
WHERE
    c.object_id = OBJECT_ID('MyTable')    


DECLARE @id varchar(36)
DECLARE @sql varchar(200)
declare @receiver table(theCount int)

DECLARE length_cursor CURSOR
    FOR SELECT ID, SQLText FROM @results WHERE MaxLength != 'NA'
OPEN length_cursor
FETCH NEXT FROM length_cursor
INTO @id, @sql
WHILE @@FETCH_STATUS = 0
BEGIN
    INSERT INTO @receiver (theCount)
    exec(@sql)

    UPDATE @results
    SET Longest = (SELECT theCount FROM @receiver)
    WHERE ID = @id

    DELETE FROM @receiver

    FETCH NEXT FROM length_cursor
    INTO @id, @sql
END
CLOSE length_cursor
DEALLOCATE length_cursor


SELECT 
    TableName, 
    ColumnName, 
    DataType, 
    MaxLength, 
    Longest 
FROM 
    @results