Create table X(
var1 varchar2(20) null,
var2 varchar2(20) not null,
constraint pk_var1 primary key(var1)
We all know Primary key doesnt treat NULL as a value. But the above statement is fine to be executed without problem.
Is this something to be highlighted? or am i not right in understanding 'var1 varchar2(20) null '?
what is difference between primary key and unique+not null
View 12 Replies View RelatedI wanted to print 'null' when the column value is null. Actually, i am doing something like this
select empno||','||''''||ename||'''''||','||comm||','||sal from emp
It gives the following output for example
7369,'pointers',,200
If I use the above values to form a insert statement it throws
an error. As 'comm' value is not there.
I wish to get something like
7369,'pointers','',200
or
7369,'pointers',null,200
from the above select query
note I dint copy paste the query exactly from my sql*plus session as I am away from my oracle machine
The line highlighted in Bold is where I have the issue. I want it to pick up NULL or Blanks in the method type has well as types E,G,T. I've tried NULL is the statement, "", and '' put none of these work. What am I doing wrong? I'm using 11g by the way
select specialty,
member_id,
sp_id,
service_date,
sum(case when method_type = 'C' then (payment_total) end) "CONSULTATION",
sum(case when method_type = 'M' then (payment_total) end) "MOT",
sum(case when method_type = 'D' then (payment_total) end) "TESTS",
[Code]....
give two conditions under NULLIF statement when we are using it in a sql script to load data into a table.
View 6 Replies View Relatedi am trying to analyze a query i have and noticed that it does not show the sql_id in v$session.
preparing a test case:
create table t1(a number, b varchar(10));
insert into t1 values(123 , 'value1');
when i execute
select count(*) from dual;
select * from dual;
select count(*) from t1;
i can see the sql_id by running
select
sql_id sql_id_,
sql_child_number sql_child_num,
module module_,
action action_,
logon_time lgtime,
[code]....
however, when i'm running
select * from t1
sql_id and sql_child_id in v$session appears to be null, and i can't analyze it.
why those columns are NULL?
primary key should be
W1
W2
W3 like this.
1,2,3 are sequence numbers.
A Master form in a tabular format. Id is a display item. I want to auto generate Id with following query.
select nvl(max(issue_id),0)+1 into :issue_mt.issue_id from issue_mt;
It works:
1)When each record is saved before creating new record.
It doesn't work:
2)If multiple records are entered with out saving each record.
What to do to generate unique Id in both cases?
how to create a primary key with out creating an index?
View 10 Replies View RelatedI have to create primary key using local on a partitioned table.
Since the table is huge it has to be done parallel. Following stmt is giving error
alter table XYZ add CONSTRAINT PKN_XYZ PRIMARY KEY (ID,LogDtTm)
USING INDEX LOCAL parallel 25 INITRANS 5 TABLESPACE OLTP_IDX_TS ;
i'm new to oracle environment.how can i specify NONCLUSTERD INDEX on Primary cloumn during table creation.By default it will create clusterd index but i need non-clusterd index on it.
I'm using following stmt to create normal primary constarint during table creation,
CONSTRAINT PKFORM_PROPS PRIMARY KEY (FORM_PROPS_PK) USING INDEX TABLESPACE DB123_INDEX
how can i change the above query, so that it should create NONCLUSTERED INDEX on Primary key column.
I want to create a trigger with the requirement of achieving Primary key functionality.
I have a "EMP" table. the table already contains a duplicate data on "EMPNO" column. i want to restrict entering duplicate data further into table for that i want to create a trigger.
where can i find different triggering events of DML(like update, delete etc...)and DDL(database and schema level).
Why can't we create null constraint on table level?
View 20 Replies View RelatedI'm trying to create a sequence for a primary key to simply auto-increment by the default of 1. I have a sql script written to generate mt tables, and I'm not sure how to modify the script to include the sequence. I also just want the sequence for a specific column, ie, PK, not the PK in all tables.
Here's a snippet from my script:
create table image
(
image_id int NOT NULL,
source_id int NOT NULL,
CONSTRAINT image_id_pk PRIMARY KEY (image_id),
CONSTRAINT fk_source_id FOREIGN KEY (source_id) REFERENCES source(source_id)
);
Would I add the create sequence statement right after the create table, and if so, how do I apply the sequence to only 1 table and a single column?
What is difference when you issue a create controlfile with "standby" keyword on the primary database
ALTER DATABASE CREATE STANDBY CONTROLFILE AS '/path/db_stby.ctl';
vs. creating a control using
ALTER DATABASE BACKUP CONTROLFILE to '/path/db_control.ctl';
what does ORACLE put into the standby control that is "extra"? ie. what is the difference between a standby control file and a normal control file?
I'm trying to do is create 4 simple tables. This is my first project using SQL so I'm totally new to it, not just SQL itself but database design/management, including foreign/primary key concepts. I think that's why the errors are being generated due to a duplication of foreign key names (perhaps?) but I really don't where I'm going wrong with the design structure in terms of the FK's and the relationships.
Added the error report in the attachment.
Create Table Hotel
(Hotel_No Char(4 Byte) Not Null,
H_Name VarChar2(20 Byte) Not Null,
H_Address VarChar2(30 Byte),
Constraint Hotel_PK Primary Key (Hotel_No));
Create Table Room
(Room_No VarChar2(4) Not Null,
Hotel_No Char(4) Not Null,
R_Type Char(1),
R_Price Number(5,2),
Constraint Room_PK Primary Key (Room_No, Hotel_No),
Constraint Hotel_No_FK (Hotel_No) References Hotel(Hotel_No));
Create Table Booking
(Hotel_No Char(4) Not Null,
Guest_No Char(4) Not Null,
Date_From Date Not Null,
Date_To Date,
Room_No VarChar2(4),
Constraint Booking_PK Primary Key (Hotel_No, Guest_No, Date_From),
Constraint Guest_No_FK Foreign Key (Guest_No) References Guest(Guest_No),
Constraint Hotel_No_Room_No_FK (Hotel_No, Room_No) References Room(Hotel_No, Room_No),
Constraint Hotel_No_FK (Hotel_No) References Hotel(Hotel_No));
Create Table Guest
(Guest_No Char(4) Not Null,
G_Name VarChar2(30),
G_Address VarChar2(35),
Constraint Guest_PK Primary Key (Guest_No));
Is it possible to create sequence using EXECUTE IMMEDIATE statement. The sequence name will be the bind variable.
DECLARE
TEMP VARCHAR2(20);
BEGIN
TEMP := :P2_INFO;
EXECUTE IMMEDIATE 'CREATE SEQUENCE' TEMP;
END;
This creates a sequence named TEMP, but i want the name :P2_INFO entered by user.
I am attempting to read from the maillog of our server, but I wish to make as few changes as possible for fear of blocking other systems access to the file.
I was initially going to call create directory maillogs as '/var/log/maillog' and then drop directory maillogs; when I was done but I found my user does not have "create any directory" permissions.
Rather than compromise security of the existing database configuration, I thought I would permanently add the maillogs to the list of available data directories. Are there any implications to the filesystem if I do this, or should I be able to add this without consideration of affects.
Understand that I will only be opening the file for (R) READ TEXT access only.
Primarily I am concerned that Oracle (in the background) will keep a file pointer open or something of that nature that would block other programs from writing to the file even after I close the file pointer. I want to make as little impact as possible to the file system.
I have the following create table statement:
create table SELECTION_BOOKMARK(
INSTALLATION_ID SMALLINT NOT NULL,
BOOKMARK_ID SMALLINT NOT NULL,
NAME VARCHAR2(50) NOT NULL,
SORT_ORDER SMALLINT NULL
);
When I execute this statement as part of a SQL script, it throws the error "ORA-01003: no statement parsed". If I execute it as a stand alone sql command, it returns no error.
Here's the strange thing, though. Even when it throws the error message the table is created. Later on in the script, I execute the following command:
alter table SELECTION_BOOKMARK add primary key(INSTALLATION_ID,BOOKMARK_ID);
This command also throws the above mentioned error, but once again the command executes - the primary key is created.Well, I don't like having a script that throws errors. Eventually I'll have to give this script to a dba in another organization and I don't want my script to be throwing errors - even if it's apparently working correctly despite the errors.
I need to create a SQL insert statement with mutipleValues and an select statement I am trying this it works -
insert into uwa_crew_ids(crew_ID, CREATION_DATE, CREATED_BY,LAST_UPDATE_DATE,LAST_UPDATED_BY, LAST_NAME, first_name )
values
( uwa_crew_ids_s.nextVal,sysdate, 1767,sysdate, 1767,'TEST1', 'NITA')
This statement does not work (with or without keyword) Is there any alternate syntax
insert into uwa_crew_ids(crew_ID, CREATION_DATE, CREATED_BY,LAST_UPDATE_DATE,LAST_UPDATED_BY, LAST_NAME, first_name )
( uwa_crew_ids_s.nextVal,sysdate, 1767,sysdate, 1767,(select last_name, first_name from uwa_crew_ids where guid = '8795EAAFBE694F8EE0440003BA2AEC90' ))
oracle 11gr2
linux
how to generate insert script by using command prompt. Actually am using toad generating insert statement but it is taking too long time to generate.
is it possible to create primary key on view and use this view for creating foreign key .
View 3 Replies View RelatedI've to create a table which has 650 fields and the total length of CREATE TABLE statement got to be more than 4000 characters.I've to create the table by inserting the CREATE TABLE statment in a variable (V1) then by using EXECUTE IMMEDIATE V1 Since VARCHAR2 only supports upto 4000 characters length string, how can I create such table??
DECLARE
V1 VARCHAR2(4000);
BEGIN
V1 :=
-- CREATE TALBE STATEMENT WITH LENGTH MORE THAN 4000
EXECUTE IMMEDIATE V1;
END;
Quote:got the error -- PL/SQL: numeric or value error: character string buffer too small
How can I create such table??
this statement is taking 1hr , can we reduce the timing?
CREATE TABLE DGT_ITEMEFFORTDATA (ENTERPRISEID, OWNERTYPE, OWNERID, SUPEROWNERTYPE, SUPEROWNERID,
ITEMTYPE, ITEMID, STAGEID, USERID, DATEIDENTIFIED,
DATECLOSED, ACTIVITYCODEID, PHASEID, RELEASEID, MONTHID,
QUARTERID, INITIALEFFORT, BASELINEDEFFORT,
ACTUALEFFORT, ITEMSTATUS, ALLOCATIONSTATUS, STAGESTATUS,
OCCURANCETYPE, DSLPROJECTTYPE, METRICCALCRUNID,
[code].....
This is the explain plan of the above query
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%C
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 11M| 4137M| 46149 (
| 1 | UNION-ALL | | | |
| 2 | TABLE ACCESS FULL| DGT_ITEMEFFORTDATA_DAILY | 3455K| 428M| 14575
[code].....
This is the index details
1DGT_ITEMEFFORTDATA_DAILYHCLT_IDX_DGT_IFDITEMID4
2DGT_ITEMEFFORTDATA_DAILYHCLT_IDX_DGT_IFDITEMTYPE3
3DGT_ITEMEFFORTDATA_DAILYHCLT_IDX_DGT_IFDOWNERID2
4DGT_ITEMEFFORTDATA_DAILYHCLT_IDX_DGT_IFDOWNERTYPE1
There is no index on DGT_ITEMEFFORTDATA_TEMP table
[code].....
I have the following query:
select col_1,col_9 from
book_temp b
where b.col_1 is not null
order by to_number(b.col_16)
;
What I want to add is the following:
COL_9
=====
NULL
A
B
NULL
C
D
E
F
NULL
G
I need to connect the NON-NULL rows to the preceding NULL row.
Can we have same execution plan for a create table statement where the name of the table changes every time as follows:
create table test
as
select * from t1
Here table name changes from test to another table name next time
Is there any difference between include program header before CREATE OR REPLACE PACKAGE statement and program header after CREATE OR REPLACE PACKAGE statement
View 4 Replies View RelatedI am running a GROUP BY query on a few columns of enumerated data like:
select count(*), Condition, Size
group by Condition, Size;
COUNT(*) CONDITION SIZE
-------- ---------- --------
3 MINT L
2 FAIR L
4 FAIR M
1 MINT S
Well, let's say I also have a timestamp field in the database. I cannot run a group by with that involved because the time is recorded to the milisec and is unique for every record. Instead, I want to include this in my group by function based on whether or not it is NULL.
For example:
COUNT(*) CONDITION SIZE SOLDDATE
-------- ---------- -------- ----------
3 MINT L ISNULL
2 FAIR L NOTNULL
2 FAIR M NOTNULL
2 FAIR M ISNULL
1 MINT S ISNULL
I have a table which has a not null column. the column is date field. I am trying to change it to Null. But it is giving a error.
I am using below query.
ALTER TABLE T_test
modify (paid_to_date null)
create table test
(
id int ,
dat date
)
/
I want to implement a business rule such as we have for each id at most 1 dat null. So, I've created this unique index on test.
create unique index x_only_one_dat_cess_null on test(id, case when dat_cess is null then 'NULL' else to_char(dat_cess, 'dd/mm/yyyy') end);
insert into test values (1, sysdate);
insert into test values (1, sysdate - 1);
insert into test values (1, null);
insert into test values (1, null);
-- -----
insert into test values (2, sysdate);
insert into test values (2, sysdate - 1);
insert into test values (2, null);
The 4th insert will cause an error and this is what I wanted to implement. OK. Now the problem is that for non-null values of dat, we can't have data like this
iddat
------------
124/10/2013
123/10/2013
123/10/2013
1
because of the unique index (the 2nd and the 3rd row are equal). So just for learning purposes, how could we allow at most one null value of dat and allow duplicates for non-null values of dat.