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what is primary key | Topic profile

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SQL and PL/SQL
Started 1 week, 3 days ago (2009-12-11 00:53:00)  by user8781179
Hi What is the need of primary key as opposed to using not null and unique ? Regards
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Forum:  SQL and PL/SQL   SQL and PL/SQL - forum profile
Thread:  Show this thread (4 posts) More from What is the need of primary key as opposed to using not null and unique ? Thread Thread info: What is the need of primary key as opposed to using not null and unique ? Size: 337 bytes
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SQL and PL/SQL
Started 1 week, 3 days ago (2009-12-11 02:33:00)  by Toon Koppelaars
For all practical reasons: none. From a relational database theory perspective there is only one concept: a key. The SQL standard decided to introduce two concepts: PK and UK, where PK is in essence UK+NotNull-on-all-key-columns.
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Forum:  SQL and PL/SQL   SQL and PL/SQL - forum profile
Thread:  Show this thread (4 posts) More from What is the need of primary key as opposed to using not null and unique ? Thread Thread info: What is the need of primary key as opposed to using not null and unique ? Size: 491 bytes
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Microsoft SQL Server
Started 2 days, 19 hours ago (2009-12-19 00:28:00)  by scias23
what does PK,FK1 means? is the field a primary and the same time a foreign key?
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Forum:  Microsoft SQL Server  Microsoft SQL Server - forum profile
Thread:  Show this thread (9 posts) More from implementing supertype-subtype Thread Thread info: implementing supertype-subtype Size: 79 bytes
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Oracle
Started 2 weeks, 5 days ago (2009-12-02 13:53:00)  by raf
Quote: Originally Posted by anacedent >The primary key PK_ID comes from the TABX_TO_TABY table linked in this way: >name_last||'_'||substr(name_first,1,3)||'_'||subs t r(cod_id,-3) What happens to PK_ID when LENGTH(LAST_NAME)>24? I haven't LENGTH(LAST_NAME) > 24 IF I have I run: ALTER TABLE TABY ...
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Forum:  Oracle  Oracle - forum profile
Thread:  Show this thread (10 posts) More from HELP on How Create a STORED PROCEDURE Thread Thread info: HELP on How Create a STORED PROCEDURE Size: 1,102 bytes
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Microsoft Access
Started 3 weeks, 6 days ago (2009-11-24 13:38:00)  by pkstormy
Your 'data' form typically has a recordset (which has an autonumber or primary key field). In your search forms, the key field you have that same autonumber or primary key (which is the 1st column in the listbox depending on what search form you're looking at.) When you click (or double-click) on the record in the listbox, you first store that autonumber into a variable (ie. CID), then close ...
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Thread:  Show this thread (8 posts) More from Forms that communicate info well Thread Thread info: Forms that communicate info well Size: 1,176 bytes
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Started 1 month ago (2009-11-20 13:39:00)  by manjunath.hota
Re: Sql - There is a eno & gender in a table. Eno has primary key and gender has a check constraints for the values 'M' and 'F'. While inserting the data into the table M was misspelled as F and F as M. What is the update statement to replace F w update emp_vas1 x set x.gender = ( select nvl(replace(decode (gender, 'M', '*'),'*', 'F' ),...
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Thread:  Show this thread (2 posts) More from Sql - There is a eno & gender in a table. Eno has primary key and gender has a check constraints for the values 'M' and 'F'. While inserting the data into the table M was misspelled as F and F as M. What is the update statement to replace F with Thread Thread info: Sql - There is a eno & gender in a table. Eno has primary key and gender has a check constraints for the values 'M' and 'F'. While inserting the data into the table M was misspelled as F and F as M. What is the update statement to replace F with Size: 829 bytes
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Database Concepts & Design
Started 1 month ago (2009-11-17 17:48:00)  by Brett Kaiser
Quote: Originally Posted by jarrette I prefer going to 3nf for the phonenumber tables and having a single, primary key. I am a web developer and maintaining an "old phone number" through page posts isn't as easy as building a winforms app, plus what if they put the same number for "fax" and "home" phones? Seems much easier to just ...
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Forum:  Database Concepts & Design  Database Concepts & Design - forum profile
Thread:  Show this thread (56 posts) More from normalizing the PhoneNumbers table Thread Thread info: normalizing the PhoneNumbers table Size: 1,380 bytes
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Microsoft Access
Started 1 month ago (2009-11-16 21:35:00)  by pkstormy
What I usually do for situations like this is run an append query (making sure the primary key of the table design doesn't allow duplication where necessary.) The expression in the query (to append to the RecordID type field) is =Forms!My1stForm!RecordID). After the record has been appended to the 2nd archiving table (by running the append query), then it's a matter of opening the 2nd form ...
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Thread:  Show this thread (8 posts) More from Replicating a Field Thread Thread info: Replicating a Field Size: 812 bytes
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PostgreSQL
Started 1 month, 1 week ago (2009-11-13 14:38:00)  by codehunter
A follow up question... what if I want to list all columns in the orders-table, not just the primary key? I thought I could figure this out but I failed /codehunter
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Forum:  PostgreSQL  PostgreSQL - forum profile
Thread:  Show this thread (16 posts) More from Need help with a many-to-many relationship join Thread Thread info: Need help with a many-to-many relationship join Size: 340 bytes
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Microsoft SQL Server
Started 1 month, 1 week ago (2009-11-10 17:04:00)  by Brett Kaiser
Is this what you are describing? Code: CREATE TABLE myTable99(Col1 int PRIMARY KEY, Col2 char(1), Col3 datetime) GO CREATE PROC Sproc1 AS BEGIN TRAN INSERT INTO myTable99(Col1) SELECT 1 COMMIT TRAN GO CREATE PROC Sproc2 AS BEGIN TRAN INSERT INTO myTable99(Col1, Col2) SELECT 2, 'b' COMMIT TRAN GO CREATE PROC Sproc3 AS BEGIN TRAN INSERT INTO myTable99(...
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Thread:  Show this thread (5 posts) More from Rolling back commited nested stored procedure changes.. Thread Thread info: Rolling back commited nested stored procedure changes.. Size: 976 bytes
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Oracle
Started 1 month, 3 weeks ago (2009-10-31 08:30:00)  by shammat
Ok, so the tables have a different structure. - Do you want matching rows from CELLSTATS and NUCELLREL? If yes, what is the (primary) key that can be used to identify matching rows. - Do you want all rows from both tables with just the corresponding columns?
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Forum:  Oracle  Oracle - forum profile
Thread:  Show this thread (14 posts) More from Connecting 2 tables... Thread Thread info: Connecting 2 tables... Size: 290 bytes
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