Constraints are always attached to a column not a table.
We can add constraints in three ways.
Column level -- Along with the column definition
Table level -- After the table definition
Alter level -- Using alter command
While adding constraints you need not specify the name but the type only, oracle will internally name the constraint.
If you want to give a name to the constraint, you have to use the constraint clause.Create table with Constrains with Example:
CREATE TABLE emp
(
empno NUMBER PRIMARY KEY,
ename VARCHAR2 (50) NOT NULL,
job VARCHAR2 (10),
mgr NUMBER,
hiredate DATE DEFAULT (SYSDATE),
sal NUMBER,
hrly_rate NUMBER,
comm NUMBER,
deptno NUMBER NOT NULL
);
Note: To know more about constrains >SQL Constraints
Hi There,
ReplyDeleteZoooooooom! That’s how speedy and easy this read was! Looking forward to more of such powerful content on Create SQL Table With Constrains.
I need your help please, I am new at PL/SQL
I need to run a select command with multiple values, if a break down this query into 3 pieces and run them,they works perfectly, but Ive got problems whenever i execute this query because there are multiple values into the where clause and i think its necessary to create lines break so it may work perfectly
how can I get through this?
SELECT job_name, command,description,days_of_week,start_mins,machine, J2.CREATE_STAMP, J2.MODIFY_STAMP
FROM MDBADMIN.UJO_JOBROW JR JOIN MDBADMIN.ujo_job2 J2
ON (JR.JOID = J2.JOID)
WHERE job_name IN ('coscl_PM_zip_log','coscl_PM_clear_log','coscl_PM_alarma_fs','coscl_PM_pmapp1_PM_up','coscl_PM_control_recargas_cod_11','coscl_PM_control_recargas_ingreso','coscl_PM_control_rec_error_cc_agrup_v1'.'coscl_PM_control_procesos_diarios','coscl_PM_rep_recar_x_estado','coscl_PM_control_tiempos_recargas',
'coscl_PM_control_porcentaje','coscl_PM_control_puertos_bloq','coscl_PM_control_errores', 'coscl_PM_control_java','coscl_PM_control_error_cache');
Thank you very much and will look for more postings from you.
Merci
Niraj
Hello There,
ReplyDeleteI learnt so much in such little time about Create SQL Table With Constrains. Even a toddler could become smart reading of your amazing articles.
I have requirement like
select COL1,Col2 from A
minus
Select COL1,COL2 from B;
both tables have 50+ millions record so I want to automate a job which will execute this query for 1millions records for one time and then again 1 millions for second time...like loop and store output in record type.
But nice Article Mate! Great Information! Keep up the good work!
Kind Regards,
Preethi.
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ReplyDelete