how can i delete a record in sql using more than 1 table

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SQL-server-2000

A.O.A

hi,
im having a problem in sql, can anyone help me
i have 3 tables
sublocation, postingdetail and employee

i have to delete sublocid from sublocation table
but first i have to check that is there any employee working on that sublocation from postingdetail table, if yes then the record shouldn't be deleted.

plz reply

SQL

table sublocation
------------
 sublocid
 sublocname
 mainlocid

table postingdetail
============
 empid
 subloc
 mainloc

table employee
==========
 empid
 empname
 sublocid
 mainlocid

Posted 6-Jan-12 19:22pm

zainknoman

Updated 6-Jan-12 19:32pm

Tejas Vaishnav

v3

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Comments

Tejas Vaishnav 7-Jan-12 1:39am

Hello friend please provide the defination of PK and FK so we will give the out put for your question....

Tejas Vaishnav 7-Jan-12 1:40am

and also what type of data will be in postingdetail.subloc is it id or name...

3 solutions

Solution 3

If the postingdetail.subloc is the sublocid then use this query to delete sublocation from sublocation where any employee will not working

SQL

DELETE FROM sublocation WHERE sublocid NOT IN (
	SELECT sublocid FROM employee
	WHERE sublocid NOT IN ( SELECT subloc FROM postingdetail) 
)

Posted 6-Jan-12 19:55pm

Tejas Vaishnav

Comments

Tejas Vaishnav 7-Jan-12 1:56am

if my answer solve your problem then accept it as ans and also rate it...

Solution 5

You can delete your sublocations by using a stored procedure like this :

SQL

create procedure sp_DeleteSubLoc
@sublocid int
as
begin
  if ((select count(*) from [posting detail] where sublocid = @sublocid) = 0)
  begin
     delete sublocation where sublocid = @sublocid
     return 0
  end
  else
  begin
     return 1
  end
end

you can use it by this way :

SQL

DECLARE	@return_value int

EXEC	@return_value = sp_DeleteSubLoc 15

SELECT	'Return Value' = @return_value

15 is an example for @sublocid, if it succeeds returns 0 otherwise returns 1.

Hope it helps.

Posted 6-Jan-12 22:49pm

Amir Mahfoozi

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zainknoman · Accepted Answer · 2012-01-06T19:41:00

table : Sublocation
====================

   columnName        DataType        Length    Allow Nulls
PK	SubLocID	    numeric               9       	0
	SubLocName	varchar	             50    	1
FK	MainLocID	   numeric                9     	1
	ShrtDesc	    varchar	            50    	1

table : Posting Detail
====================

   columnName        DataType        Length    Allow Nulls
PK	TID	          numeric	        9			0
FK	LocID	        numeric	        9			1
FK	SubLocId		numeric				9			1
	DesigId			numeric	        9			1
	RegPosting		numeric	        9			1
	Posted	        numeric			9			1

table : Employee
====================

   columnName        DataType     Length    Allow Nulls
PK	TID                numeric        9             0
FK	EMPID             varchar     	 50	        1
	EmpName		  varchar        250            1
	EmpCodePrefix     varchar         50            1
	EmpNo             varchar         50            0
FK	DeptID            numeric            9           1
FK	MainLocID         numeric           9            1
FK	SubLocID	numeric	         9	1