I have a table which has duplicates in column D as shown in the image. For a value in col A, there should not be any duplicates on column D.
How can I update the table without using delete statement as my table has transaction properties set to false.
Related
There are multiple column in my table and I want to skip one column if value is null for that one particular column and all other columns should be updated with there respective value in oracle update query.
Is there any simple way to do this ?
Example:
Let me explain my problem with example:
I am using merge query like below :
merge into table_X on (condition )
WHEN MATCHED THEN
UPDATE SET COLUMN_1=VALUE1 , COLUMN_2=VALUE_2,........
WHEN NOT MATCHED THEN
INSERT ( COLUMN_1,COLUMN_2...) VALUES (VALUE_1,VALUE_2);
Now in update statement I want to skip the update for one column suppose COLUMN_2 if its value is null , but all other column should be updated . Basically I want to preserve the existing value when null is coming .
I have 2 tables name Table A and Table B
"Table A has 10 columns named ta1, ta2, ta3...ta10"
"Table b has 2 columns name id (PK,AI) and tb1"
My requirement is to combine "ta3" and "ta4" from table A initially,
or it will check for the "tb1" column whether any same data is available, if available do nothing else insert the new data.(if a new row is added in the ta3 or ta4, it should be added to the 2nd table column named tb1)
I have checked other functions in the for combining the data from ta3 and ta4 by using the "unnest" function, but if I use that, I'm getting stuck in the insert, as it will insert on each query rather than checking whether any data is there or not.
any solution on this legends.
simply I just want to combine 2 column from 1st table and store it in a column on 2nd table, but in 2nd table's column it should be only distinct values taken from both of those 1st table columns. this should automatically check for the values in the column of 2nd table and compare that with the new one and if there is change the insert else neglect. I hope my question is clear.
Table1
Table 2
new table-1
Expected table-2
I have a table like:
|code|price|alter_price|
|----|-----|---------|
|ABC|10|12|
|DEF|11|13|
|GHI|15|18|
How can I update column 'price' and 'alter_price' with deviating values, based on the code-column (which has also the unique constrain)?
I don't want to create duplicates.
i tried:
cursor.execute("INSERT IGNORE INTO table_name VALUES (?,?,?)", (new_code,new_price,new_alter_price))
But then it does not update the table if the row with the given code exists already.
I have a table with some columns and rows. I want to delete some rows contain specific data at specific row.
Ex: the table name is EXAM
I want to delete row 1 and row 3 when input condition string is C.
I did with the statement:
DELETE FROM EXAM
WHERE Comumn2 = 'C'
but only deleted Row 3.
To match rows which contain a specific value, use LIKE instead of =:
DELETE FROM EXAM WHERE Column2 LIKE '%C%'
Another Way of doing it by using CharIndex
DELETE FROM EXAM WHERE CHARINDEX('C',Column2)>0
I have a Scenario where i need to User Merge SQL statement to Synchronize two Tables. Let's suppose i have two tables Table A and Table B. Schema is same with the exception of one Extra Column in Table A. That Extra column is a flag that tells me which records are ready to be inserted/updated in Table B. Lets say that flag column is IsReady. It will be either true or False.
Can i use Isready=True in Merge Statement or I need a Temp table to move all records from Table A to Temp Table where IsReady=True and then use Merge SQL on TempTable and Table B???
Yes, you can use that column in the merge condition.
merge tableB targetTable
using tableA sourceTable
on sourceTable.IsReady = 1 and [any other condition]
when not matched then
insert ...
when matched and [...] then
update ...
This may help you,
merge into tableB
using tableA
on tableB.IsReady=true
when not matched then
insert (tableB.field1,tableB.field2..)
values (tableA.field1,tableA.field2..);
commit;