on December 26, 2022

Differences between columns in MapInfo

Geographic Information Systems

How do I update a column in MapInfo?

Article Details

  1. Table to Update. Use this drop-down list to specify the table you want to update or where MapInfo Pro should create the temporary column.
  2. Column to Update.
  3. Add new temporary column.
  4. Get Value From Table.
  5. Value.
  6. Join button.


How do I add a column to a MapInfo table?





Use Table > Maintenance > Table Structure. Click on Add field and then type in the name for the new column (e.g. the additional column is called Record# below). The type of the new field can be any numeric type.

How do I edit a MapInfo table?

Go to Home>Open Table and navigate to the folder where the copy was created and open the copy (or the recent files list). The table should now be editable.
 

How do you modify a column?

To modify column width:



  1. Position the mouse over the column line in the column heading so the cursor becomes a double arrow.
  2. Click and drag the mouse to increase or decrease the column width.
  3. Release the mouse. The column width will be changed.



How do you modify an existing column?

To change the data type of a column in a table, use the following syntax:

  1. SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype;
  2. My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype;
  3. Oracle 10G and later: ALTER TABLE table_name.


How do I add a column field?

To insert a single column: Right-click the whole column to the right of where you want to add the new column, and then select Insert Columns. To insert multiple columns: Select the same number of columns to the right of where you want to add new ones. Right-click the selection, and then select Insert Columns.

How do I add a column in layout?

On the Layout tab, click Columns, then click the layout you want.

  1. To apply columns to only part of your document, with your cursor, select the text that you want to format.
  2. On the Layout tab, click Columns, then click More Columns.
  3. Click Selected text from the Apply to box.




Can we add column to the existing table with data?

To perform an SQL add column operation, use the ALTER TABLE ADD command. This command alters a table and adds in a column with the specified data type. Using this command, you can add a column to a table after you have created the table.
 

How do you update all rows in a column?

Syntax: UPDATE table_name SET column_name1 = new_value1, column_name2 = new_value2 —- WHERE condition; Here table_name is the name of the table, column_name is the column whose value you want to update, new_value is the updated value, WHERE is used to filter for specific data. Let’s look at an example.
 

How do you update a column to a primary key?

We can also define the primary key after making the table, but make sure the column has the NOT NULL constraint on it. The syntax for declaring primary key after defining the table: Syntax: Alter table table_name add primary key (column_name);
 

How do you update a column in CTE?

Update a CTE after a select statment

  1. ;WITH CTE AS.
  2. (SELECT *,ROW_NUMBER()OVER(PARTITION BY id ORDER BY CHARINDEX(Name1,name)) AS RNum.
  3. FROM OwnerNames.
  4. CROSS APPLY STRING_SPLIT(Name,’ ‘)
  5. )
  6. SELECT id,Name,[1]AS LastName,
  7. CASE WHEN [3] IS NULL THEN NULL ELSE [2] END AS FirstName,