Find large object (LOB) data type columns in Azure SQL Database

Large objects in Azure SQL Database are columns with the following data types: varchar(max), nvarchar(max), text, ntext, image, varbinary(max), and xml.

The query below lists all columns with LOB data types.

Query

select t.table_schema as schema_name,
    t.table_name,
    c.column_name,
    c.data_type
from information_schema.columns as c
    inner join information_schema.tables as t
        on c.table_schema = t.table_schema
        and c.table_name = t.table_name
where t.table_type = 'BASE TABLE' 
and ((c.data_type in ('VARCHAR', 'NVARCHAR') and character_maximum_length = -1)
or c.data_type in ('TEXT', 'NTEXT', 'IMAGE', 'VARBINARY', 'XML', 'FILESTREAM'))
order by t.table_schema, 
    t.table_name,
    c.column_name

Columns

  • schema_name - name of the schema
  • table_name - name of the table
  • column_name - name of the column
  • data_type - type of data

Rows

  • One row: represents one column with a LOB data type
  • Scope of rows: all rows containing LOB data types in the current database
  • Ordered by: schema name, table name and column name

Sample results

List of LOB columns in the AdventureWorksLT database:

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