sql - Unable to drop default constraint in oracle. Tried the below code but doesn't work - 


sql> alter table customers modify age int default 10;

table altered.

sql > alter table customers alter column age drop default;  error @ line 2: ora - 01735 : invalid alter table option.

you alter statement wrong , cannot use 2 alter command in 1 statement. , never drop default value instead set null.

if column has default value, can use default clause change default null, cannot remove default value completely. if column has ever had default value assigned it, data_default column of user_tab_columns data dictionary view display either default value or null.

alter table

use following sql command drop default.

alter table constomers modify age default null;

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