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I want to remove duplicate rows within my database.
I only want them removed if each field within that row matches another within the same table.
I've researched how to use the Query wizard to find duplicate fields, but I haven't found a way to match the entire row.
Are you able to perform queries?
DELETE FROM table_name
LEFT OUTER JOIN (
SELECT
MIN(RowId) as RowId,
column_name1,
column_name2,
column_name3
FROM
table_name
GROUP BY
column_name1,
column_name2,
column_name3
) as nonDuplicates ON
table_name.RowId = nonDuplicates.RowId
WHERE
nonDuplicates.RowId IS NULL
Related
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I have two tables
TABLE1
-DATADATE
-ISIN
-INDEXNAME
TABLE2
-AS_OF_DATE
-ISSUER_ISIN
-GPSCORE
-SPSCORE
I would like to merge the two tables by matching on:
AS_OF_DATE = DATADATE
and
ISIN = ISSUER_ISIN
Try this one:
SELECT * FROM TABLE1 tb1
INNER JOIN TABLE2 tb2
ON tb1.DATADATE = tb2.AS_OF_DATE
AND tb1.ISIN = tb2.ISSUER_ISIN
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Closed 7 years ago.
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I'm trying to delete the contents of the entire table using UPDATE command please help me out with this...
I tried using SET clause and tried to set all the fields to NULL value..But its not Working please tell Me
You cannot delete rows using UPDATE command. You can empty them - set NULLs to all columns, but rows remains in the table. Use
DELETE your_table;
all rows in your_table will be deleted.
if you are so sure you are not going to need this data anymore. [faster]
truncate table [table_name];
This one will generate redo and you could rescue data with -flashback to time- or -flashback table to beofre drop-
delete [table_name];
Regards.
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Closed 8 years ago.
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select 'open' as "documentno" from c_order
union all
select documentno as "documentno" from c_invoice
.This is not working in oracle.
i need a query that works in both oracle and postgres
You have not provided enough information to answer your question.
My guess is that you want to include columns in a union that do not have the same data type and are looking for a way to cast a number to a character value (again I'm guessing because you didn't tell us what data type documentno is).
The following works in Oracle and Postgres:
select 'open' as "documentno" from c_order
union all
select cast(documentno as varchar(20)) as "documentno" from c_invoice;
However: the first part of the union does not make sense. Why are your retrieving the same constant value for each and every row in c_order without any additional information from that table?
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how can I convert rows of my table as column value
for eg I have a table a
emp id
1
2
3
4
and I want my output as
1 2 3 4
i am also using pivot in oracle and crosstab in postgres but not able to get desired solution as shown above.
Check the listagg function. Note you need at least Oracle 11 for this.
Use this script and change it to your values to get desired results
SELECT * FROM (SELECT emp_id, emp_points
FROM emp_data)
PIVOT (
SUM(emp_points) AS sum_emp_points
FOR (emp_id) IN (1 AS [1], 2 AS [2],3 AS [3],4 AS [4])
);
select * from (select empno from t7) pivot(min(empno) for empno in (1,2,3,4));
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Oracle Data masking. How do I mask the data by XXX of a particular column of Table.
RLS policy doesn't work for me.
For security reasons the value is replaced by XXX, so actual value should remain same, and it should be automated for the user
Revoke select on your_table from particular_user;
create view view_on_table as
select col1, col2, 'xxx' as particular_column, col3
from your table;
grant select on view_on_table to particular_user;
:)
Oracle's Virtual Private Database is the only way I know of to make this happen, given your constraint that this must be a direct query against the table: http://www.oracle.com/technetwork/database/security/index-088277.html