PostgreSQL has no option to specify the position of the new column in the table. You can't decrease the size less than maximum size of existing data. ALTER TABLE table_name { ALTER COLUMN column_name TYPE new_data_type } For other column types all I can think of is to add a new column with a correct datatype, then insert all data from old column to a new one, and finally drop the old column. A single ALTER TABLE statement can be used to modify multiple columns in a table. Syntax ALTER TABLE table_name ADD COLUMN column_name data_type, ADD COLUMN column_name data_type; When you add a new column to the table, PostgreSQL appends it at the end of the table. As noted in the ALTER TABLE documentation, you can change length of VARCHAR columns using. addColumn. You cannot add a column that is the distribution key (DISTKEY) or a sort key The table being altered must not be in an incomplete state because of a missing unique index on a unique constraint (primary or unique key). You can add only one column in each ALTER TABLE statement. Alter Redshift Table column Data type using Intermediate Table. You cannot add a column that is the distribution key (DISTKEY) or a sort key (SORTKEY) of the table. Below is the example of alter redshift table column data type by using intermediate table: Increasing column size/type in Redshift database table. The new capability simplifies user experience in maintaining the optimal sort order in Redshift to achieve high performance as their query patterns evolve and do it without interrupting the access to the tables. Amazon Redshift now enables users to add and change sort keys of existing Redshift tables without having to re-create the table. Uses. Add multiple columns to existing table. Using ALTER TABLE … ADD PARTITION, add each partition, specifying the partition column and key value, and the location of the partition folder in Amazon S3. How to add multiple columns to existing table. The addColumn Change Type adds a new column to an existing table.. Alter syntax and example. Add the partitions. But if the column is last column in the table you can add new column with required changes and move the data and then old column can be dropped as below. How to add a sort key to an existing table in AWS Redshift, You can add only one column in each ALTER TABLE statement. The … No, you can't increase the column size in Redshift without recreating the table. Each change is specified as a clause consisting of the column and column property to modify, separated by commas: Use either the ALTER or MODIFY keyword to initiate the list of clauses (i.e. columns/properties to modify) in the statement. You can add multiple partitions in a single ALTER TABLE … ADD statement. To add multiple columns to an existing table, you use multiple ADD COLUMN clauses in the ALTER TABLE statement as follows: To avoid the schema change mentioned above, you can use the intermediate table to add new column with correct data type. ALTER COLUMN column_name TYPE new_data_type A clause that changes the size of a column defined as a VARCHAR data type. CREATE TABLE t1 ( c1 vachar(MAX), c2 int ); First, create a new table that has the same columns as t1, but with the addition of the identity column that you want to add: CREATE TABLE t2 ( id bigint IDENTITY(1,1), c1 varchar(MAX), c2 int ); Then, insert all of the rows of t1 into t2, filling every column other than the identity column: Consider the following limitations: You can't alter a column with compression encodings BYTEDICT, RUNLENGTH, TEXT255, or TEXT32K. 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