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Redshift alter table column size8/23/2023 You should specify the default value.įor example, consider following ALTER statement to add NOT NULL column with default value. 2 Answers Sorted by: 23 According to Redshift Documentation, You can add only one column in each ALTER TABLE statement. You can also add new column with NOT NULL constraint to the existing table. here is the syntax I'm using and the error I got. Is there anyway to do that without losing data. You can't alter columns with default values. You can't decrease the size less than maximum size of existing data. since this column already contains data I could not alter the column. In AWS Redshift is now possible to alter ONLY VARCHAR column but under these conditions: You can’t alter a column with compression encodings BYTEDICT, RUNLENGTH, TEXT255, or TEXT32K. the rate column has numeric data type with (18,2). Therefore, Redshift database enforces the NOT-NULL constraint. 1 I have a table in Redshift which has rate column and date column. # insert into notnull_demo_table values(null,'abc','') ĮRROR: Cannot insert a NULL value into column idĮrror: Cannot insert a NULL value into column idĪs you can see in the above example, you can only insert non-null values. # insert into notnull_demo_table values(1,'abc','') NOTE: The view can be made up of 1 or more than 1 tables, so you need to change the column size of all those base tables. 3- Now Change the column size of that base table. You will end up getting an error if the value is NULL.įor example, following insert statement demonstrates the not null constraints in Redshift. 2- Above query will you a table where you will find the base table under the column name REFERENCEDNAME. Now, the Redshift database will allow only non-null values in the ID column of the notnull_demo_table. You can add the NOT NULL to the Redshift table DDL along with column the data type.įor example, consider below table DDL with a column ID defined as NOT NULL. For example, consider below table DDL with a column ID defined as NOT NULL. You can add the NOT NULL to the Redshift table DDL along with column the data type.
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