I'm trying to delete all the rows in tblProInfo,tblOrderAA where tblProInfo.proInfoScienceName='shalosh'
Here is the command I wrote. I get a message that it couldn't generate my query.
DELETE tblOrderAA.*, tblProInfo.*
FROM tblProInfo INNER JOIN tblOrderAA ON tblProInfo.proInfoSerialNum = tblOrderAA.orderAASerialPro
WHERE (((tblProInfo.proInfoScienceName)='shalosh'
DELETE a1, a2
FROM tblProInfo as a1 INNER JOIN tblOrderAA as a2
ON a1.proInfoSerialNum = a2.orderAASerialPro
WHERE a1.proInfoScienceName='shalosh'
The syntax is correct as per msaccess but doesn't delete records. Access delete queries cannot delete from more than one table at a time. This is an Access limitation.
Refer here to know about deleting records from multiple tables in MS-Access
If both tables are connected and referential integrity set such that deletes are cascaded then you can cause records to be deleted from both tables at the same time by simply deleting the record on the One side of the link.
In Sql Server:
The concept of deleting rows from multiple tables in a single delete statement cannot be done in sql server. There is the concept of triggers on the tables that do deletes in a cascading style.
On this line you have 3 opening brackets and 1 closing bracket:
WHERE (((tblProInfo.proInfoScienceName)='shalosh'
You have to separate the statements. You can not delete from two tables with one query
DELETE FROM tblOrderAA
WHERE tblOrderAA.orderAASerialPro IN
(
SELECT orderAASerialPro
FROM tblProInfo WHERE tblProInfo
tblProInfo.proInfoScienceName='shalosh'
)
DELETE FROM orderAASerialPro
WHERE tblProInfo.proInfoScienceName='shalosh'
Related
Scenario:
I need to write an SQL script which will remove all records from some or all tables in a database with around 100 tables.
Some tables are 'data' tables, some are 'lookup' tables. There is nothing in their names to indicate which they are.
Sometimes I will want the script to only remove records from the 'data' tables, on other occasions I will want to use it to remove data from all tables.
The records have to be removed from the tables in a very specific order to prevent foreign key constraint violations.
My original idea was to create a variable at the start of the script - something like #EmptyLookupTables - which I could set to true or false, and then I could wrap the DELETE statements in an IF... statement so that they were only executed if the value of the variable was true.
However, due to the foreign key constraints I need to include the GO command after just about every DELETE statement, and variables are not persisted across these batches.
How can I write a script which deletes records from my tables in the correct order but skips over certain tables based on the value of a single variable? The database is in Microsoft SQL Server 2016.
The only way I know of doing this without writing a parser for DDL in TSQL is to turn it on its head.
Create a new database with the same schema; populate the lookup tables, but without the records you don't want. Then populate the data tables, but again leave out the records you don't want. Finally, rename or delete the old database, and rename the new database to the original name.
It's still hard, though.
Create a #temp table and store your variable in it, it will persist across GO separated batches. Then just check the temp table inside every batch.
SELECT #EmptyLookupTables AS EmptyLookupTables INTO #tmp
GO
DECLARE #EmptyLookupTables BIT
SELECT #EmptyLookupTables = EmptyLookupTables FROM #tmp
DELETE FROM YourLookupTable WHERE #EmptyLookupTables = 1
GO
or you can even join directly on #temp table in delete command
DELETE l FROM YourLookupTable l
INNER JOIN #tmp t ON t.EmptyLookupTables = 1
I created a query that will delete rows from three tables that has 'Employee'.
When I execute it, it only deletes rows from one table tblEmployeeType. I tried adding Alias of other tables beside DELETE but SQL does not support it. Is there any alternative way of deleting rows from multiple tables? or I forgot some codes on my query or should I just separate delete queries? Thank you.
DELETE a
FROM tblEmployeeType a INNER JOIN
tbl_Selected_AccessType b
ON a.EmpTypeName = b.UserType INNER JOIN
tbl_AccessType_AllFunction c
ON a.EmpTypeName = c.UserType
WHERE a.EmpTypeName = 'Employee'`
INSERT and UPDATE statements can only directly affect one table at a time. If you have foreign keys configured with ON DELETE CASCADE then child records will be deleted along with the parent record. Regardless of using cascade, you should have foreign keys on the table so that your DELETE doesn't leave orphaned child records with broken referential integrity.
Another way to achieve affecting other tables in an INSERT or UPDATE is by using a trigger on the table. This can be desirable when you want to do checks before blindly deleting child records.
I want to delete some records from a table based on criteria in another table. How do you delete from one of those tables without removing the records in both table?
I am looking to delete a table which are joined with other tables and the query looks something like this.
DELETE DeletingFromTable
FROM DeletingFromTable
INNER JOIN CriteriaTable ON DeletingFromTable.field_id = CriteriaTable.id
WHERE CriteriaTable.criteria = "value" ;
This should work:
DELETE DeleteFromTable FROM DeleteFromTable AS DT
JOIN CriteriaFromTable AS CT ON DT.SomeId = CT.SomeId
WHERE CT.SomeId=[value]
Your question is not 100% clear on what your issue is, but this query will drop tables 1,2 and 3 at the same time:
DROP TABLE table1,table2,table3
You can only delete data from one table at a time.
To delete from multiple table
Write multiple queries separated by semicolon and execute it at onces like
delete from table1;
delete from table2;
delete from table3;
Or you can write the procedure to do this task.
Please check this thread as well
Drop multiple tables in one shot in mysql
You can use:
DELETE FROM TableName
Which will remove all the data, but if you have any seeded columns, these will not be reset. If you want to DELETE data and reset the seeding of PK's, then use TRUNCATE...
TRUNCATE TABLE TableName
But, you need to consider whether you have other tables that have referential integrity, if this is the case, see this post here SQL Server: How to ignore referential integrity until COMMIT?
EDIT:
Your comment above...
delete query like this DELETE FROM table_name WHERE
some_column=some_value;
...suggests you are looking to delete specific rows?
You can just write a query to DROP the tables like so:
DROP TABLE [TABLE_1]
DROP TABLE [TABLE_2]
DROP TABLE [TABLE_3]
Depending on the tables and any constraints you may have between them, you will need to DROP the tables in the correct order.
If you right click any table (depending on SQL version), you should be able to 'View Dependencies'. If the 3 tables you are planning to DROP are only dependant on each other, you need to DROP the tables with no child dependencies first to avoid it failing.
For example, if you try to delete a parent table where it's primary key is referenced in a child table as a foreign key, the DROP will fail because of this. So deleting the child table with the foreign key first will allow you to subsequently DROP the parent table.
If however, the tables have other dependencies outside the tables you are deleting, you will need to remove the dependencies before this will work.
I have two tables in my database, one is Transactions and the other is TransactionHistories. The latter is essentially an auditing table, whereby a trigger executes on insert, update and delete on Transactions to capture a screenshot of the data.
I am successfully retrieving all of the data stored in the Transactions table where the columns match, but the difficulty comes where I am trying to retrieve data from another table using a foreign key. For instance:
The transaction table has a field "TransactionType_TransactionTypeId", but in the audit table we wish to store its 'name' equivalent as "TransactionTypeName". This needs to be populated from the "TransactionTypes" table, which has the fields "TransactionTypeId" and "Name".
I am struggling to write a query to retrieve this as we wish. I am trying something similar to the following but having little success:
SELECT #TransactionTypeName=Name
FROM TransactionTypes
WHERE inserted.TransactionType_TransactionTypeId=TransactionTypes.TransactionTypeId;
I'm assuming that is a syntactic nightmare. If someone could point me in the right direction I would be extremely grateful!
well to get a name you should do the following
select #TransactionTypeName = TT.Name
from inserted as i
left outer join TransactionTypes as TT on TT.TransactionTypeId = i.TransactionType_TransactionTypeId
but you have to know that inserted table can have more than one row, and you are getting value for only one row.
I wanna delete records from child tables as well as parent table with in a single query. please find the query given below. here response header is the primary table and responseid is the primary key.
DELETE FROM responseheader
FROM responseheader
INNER JOIN responsepromotion ON responseheader.responseid = responsepromotion.ResponseID
INNER JOIN responseext ON responsepromotion.ResponseID=responseext.ResponseID
WHERE responseheader.responseid In ('67D8B9E8-BAD2-42E6-BAEA-000025D56253')
but its throwing error . can any one help me to find out the correct query
Unless you use some kind of cascading delete, a single delete statement will delete rows from a single table.
In your example, if the syntax is correct, you will be deleting rows from responseheader only, the rest of the tables are only used to determine which rows to delete from responseheader.
To be blunt, you really don't want to use a cascading delete, so you should execute multiple delete statements, one in each table.
You can either create a stored procedure and call that stored procedure to do the deletion. Or you can use sp_executesql to send batch queries in one go, as follows:
sp_executesql
'DELETE FROM responsepromotion
FROM responsepromotion
INNER JOIN responseheader ON responseheader.responseid = responsepromotion.ResponseID
WHERE responseheader.responseid = #guid;
DELETE FROM responseext
FROM responseext
INNER JOIN responseheader ON responsepromotion.ResponseID=responseext.ResponseID
WHERE responseheader.responseid = #guid;
DELETE FROM responseheader
WHERE responseid = #guid;',
#guid = '67D8B9E8-BAD2-42E6-BAEA-000025D56253'
As mentioned by Lasse cascade delete is the only option to delete from multiple tables with a single query. For that you should setup foreign key and delete the entry in the master table. There by the rows in the child table will get deleted. But its better not used. It will be better to use multiple delete statements. You can also use transaction by setting auto commit to false. Then delete the rows and manually commit or rollback as required.