How do you change the datatype of an existing column in a table in Teradata?

Question

Changing a column Datatype length in Teradata ALTER TABLE Table_Name. ADD Existing_Column_Name New_Data_Type(New_Length)

Can we alter column datatype in Teradata?

Datatype of columns cannot be changed if old datatype of column and new datatype of column are not compatible. Users will get below error if they try to change datatype. Primary index can be changed only for an empty table. Users will get below error if they try to change primary index of populated table.

How do I change the datatype of a column in an existing table?

To change the data type of a column in a table, use the following syntax:1SQL Server / MS Access: ALTER TABLE table_name. ALTER COLUMN column_name datatype;2My SQL / Oracle (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype;3Oracle 10G and later: ALTER TABLE table_name.

Which command is used to change the existing datatype of the column?

The SQL ALTER TABLE command is used to add, delete or modify columns in an existing table.

Can we change the datatype of a column with data in SQL?

You can modify the data type of a column in SQL Server by using SQL Server Management Studio or Transact-SQL. Modifying the data type of a column that already contains data can result in the permanent loss of data when the existing data is converted to the new type.

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