Here are some examples of Oracle alter table syntax to modify data columns and note that you can add constraints like NOT NULL: ALTER TABLE customer MODIFY (cust_name varchar2(100) not null, cust_hair_color varchar2(20)) ; We can also use Oracle alter table syntax in dynamic PL/SQL to modify data columns.
Irena Sendler (nÃ©e KrzyÅ¼anowska, also referred to as Irena Sendlerowa in Poland, Nom de guerre Jolanta; 15 February 1910 â 12 May 2008) was a Polish Roman Catholic nurse/social worker who served in the Polish Underground during World War II, and as head of children's section of Å»egota, an underground resistance organization in German-occupied Warsaw ...
Harriet Tubman (born Araminta Ross; c. 1820 or 1821 â March 10, 1913) was an African-American anti-slavery worker, and humanitarian. She was also a Union spy during the American Civil War. She was born into slavery but she escaped. During her life, she made nineteen trips. She helped more than 300 slaves escape. She used the Underground Railroad.