sql - Issue with null values being inserted -

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so have searched on answer, know it'll basic , silly i've overlooked life of me can't see it.

at insert "" values point, i'm stuck unable insert null values.. need spaces blank. :/

drop table patient; drop table kennel; drop table prescription; create table patient  ( patient_id               number, name                     varchar2(15), dob                      date, primary key(patient_id) ); create table kennel ( kennel_no                varchar2(2), kennel_section           varchar2(1), admission_date           date, patient_id               number,  primary key(kennel_no), foreign key (patient_id) references patient ); create table prescription  ( prescription_date        date, drug_code                varchar2 (5), drug_name                varchar2 (55), dosage                   varchar2 (25), num_days_dosage  number , kennel_no  varchar(255), foreign key (kennel_no) references kennel  ); insert patient values   (1234,'wiggles','12 dec 1996'); insert patient values   ('','',''); insert patient values   (4587, 'woofy', '15 nov 1999'); insert patient values   ('', '',''); insert patient values   ('', '',''); insert patient values   (4692,'hiccup','3 apr 1998'); insert patient values   ('', '',''); insert patient values   ('', '',''); insert patient values   (5432, 'sandy', '2 jun 2002 '); insert patient values   ('', '', ''); insert patient values   ('', '', ''); insert patient values   (2591, 'snoopy', '28 aug 2001'); insert patient values   ('', '', ''); insert patient values   (4563, 'dopey', '1 apr 2004'); insert kennel  values   (23,'a', '20 oct 2005'); insert kennel  values   ('', '', '');  insert kennel  values   (28, 'b', '10 nov 2005'); insert kennel  values   ('', '', ''); insert kennel  values   ('', '', ''); insert kennel  values   (25, 'a', '21 nov 2005'); insert kennel  values   ('', '', ''); insert kennel  values   ('', '', ''); insert kennel  values   (35,'c', '30 nov 2005'); insert kennel  values   ('', '', ''); insert kennel  values   ('', '', ''); insert kennel  values   (34, 'c', '04 dec 2005'); insert kennel  values   ('', '', ''); insert kennel  values   (30, 'b', '06 dec 2005'); insert prescription  values  ('20 oct 2005', 'co156', 'cortisone', '2 pills, 3 times day', 14, 23);   insert prescription  values  ('23 oct 2005', 'ap566','aspirin', '1 pills, 3 times day', 10, 23); insert prescription  values  ('13 nov 2005','pe312', 'penicillin', '1 pill, 3 times day', 5, 28); insert prescription  values  ('14 nov 2005','ap566', 'aspirin', '2 pills, 2 times day', 14, 28);  insert prescription  values  ('15 nov 2005','co156', 'cortisone', '2 pills, 3 times day', 10, 28);  insert prescription  values  ('22 nov 2005','pe312', 'penicillin', '1 pill, 3 times day', 2, 25); insert prescription  values  ('23 nov 2005', 'ap566','aspirin', '2 pills, 2 times day', 10, 25); insert prescription  values  ('24 nov 2005', 'be159', 'benzocaine', '2 pills, 3 times day', 7, 25); insert prescription  values  ('30 nov 2005', 'co156', 'cortisone', '1 pill, 3 times day', 7, 35);   insert prescription  values  ('02 dec 2005', 'ap566', 'aspirin', '2 pills, 2 times day', 12, 35); insert prescription  values  ('03 dec 2005', 'be159', 'benzocaine', '2 pills, 3 times day', 2, 35); insert prescription  values  ('04 nov 2005', 'co156', 'cortisone', '1 pill, 3 times day',10, 34); insert prescription  values  ('05 dec 2005', 'ap566', 'aspirin', '2 pills, 2 times day', 8, 34); insert prescription  values  ('06 nov 2005', 'pe312', 'penicillin', '3 pills, 3 times day',7,30);

your column set allow nulls, and/or have no default value. check settings on table.


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