This question already has answers here:
How to create id with AUTO_INCREMENT on Oracle?
(18 answers)
Closed 4 years ago.
How I can set default value in oracle? my query is like this :
alter table talend_job modify mtj_id varchar(10) not null default
('JASG'|| (nextval('mtj_id_seq')))
In Oracle 11g, you cannot specify a sequence number as a DEFAULT value for a column; however, you can emulate this functionality using a trigger. Even if a column is declared NOT NULL, you can still omit the column from INSERT statements to be populated in the trigger
You can refer to How to create id with AUTO_INCREMENT on Oracle?
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This question already has an answer here:
SQL: Oracle 19c unique ID
(1 answer)
Closed 1 year ago.
If I want to create a table on Oracle SQLDeveloper and put in the primary key a varchar which always starts with "c" followed by 9 digits which auto-increment, how could I?
Example: C0000000001
You could do this:
create table test_table (
id VARCHAR2(30)
constraint test_table_id_pk primary key
)
;
-- triggers
create or replace trigger test_table_biu
before insert
on test_table
for each row
begin
:id := 'c'||LPAD(test_table_seq.NEXTVAL,9,0);
end test_table_biu;
/
Note that it will start failing when the sequence reaches a 10 digit value because of duplicate values (it will cut off the extra digits).
This question already has answers here:
How to create id with AUTO_INCREMENT on Oracle?
(18 answers)
Closed 4 years ago.
I've been trying to add AUTO_INCREMENT on a created table , but the ALTER table query is not working
My Table:
Query and Error:
And also
ALTER TABLE professor ADD sno INT IDENTITY;
is not working
Can you please try:
alter table professor add sno integer generated by default on null as identity;
EDIT: Sorry, the OP is asking for 11g, as the code above works after 12.
Then you need to use sequence. Please see below:
ALTER TABLE professor ADD sno INT;
CREATE SEQUENCE dept_seq START WITH 1;
And you need to set a trigger for your sequence like:
CREATE OR REPLACE TRIGGER dept_bir
BEFORE INSERT ON departments
FOR EACH ROW
BEGIN
SELECT dept_seq.NEXTVAL
INTO :new.id
FROM dual;
END;
Reference: How to create id with AUTO_INCREMENT on Oracle?
This question already has answers here:
Inserting into Oracle and retrieving the generated sequence ID
(6 answers)
Closed 4 years ago.
Currently I have a table with this structure:
CREATE TABLE "DUMMY_SCHEMA"."NAMES"
(
"ID" NUMBER(10,0) GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1 CACHE 20) NOT NULL
, "NAME" NVARCHAR2(1024) NOT NULL
, CONSTRAINT "NAMES_PK" PRIMARY KEY ("ID")
);
In SQL Server I only need to do following to get the Id of the inserted row.
INSERT INTO [NAMES]([NAME])VALUES('Random'); SELECT SCOPE_IDENTITY() Id
What would be the equivalent for Oracle 12c?
The equivalent is
INSERT INTO dummy_schema.names (name) VALUES ('Random')
RETURNING id INTO :myvalue;
The mechanism how to pick up the returned ID depends on the host language (Java, PL/SQL, SQL*Plus etc).
This question already has answers here:
Add a column with a default value to an existing table in SQL Server
(43 answers)
Alter column, add default constraint
(7 answers)
Closed 5 years ago.
alter table enquiry alter column RejectReson int default 0
I want alter the column data type with default value zero,but it is not happening.
ALTER TABLE enquiry ADD DEFAULT 0 FOR RejectReson
If you want to affect existing rows, then use with values:
alter table enquiry
add constraint dft_enquiry_rejectreason default 0 with values;
This is explained in the documentation:
. . . WITH VALUES can be used to store the default value in the new column for each existing row in the table.
Use ADD CONSTRAINT.
For example:
ALTER TABLE enquiry ADD CONSTRAINT some_name DEFAULT 0 FOR RejectReson;
This question already has answers here:
Add a column with a default value to an existing table in SQL Server
(43 answers)
Closed 9 years ago.
How do I add a column, with a default value, to an existing table in SQLServer 2008?
ALTER TABLE {TABLENAME}
ADD {COLUMNNAME} {TYPE} {NULL|NOT NULL}
CONSTRAINT {CONSTRAINT_NAME} DEFAULT {DEFAULT_VALUE}
Add a column with a default value to an existing table in SQL Server
Use ALTER TABLE. For example
ALTER TABLE Table1
ADD col2 INT DEFAULT 0;
SQLFiddle