I have a column PRICESTABLE.PRICE with values like the following
12.356898
13.587988
I need to make an update to PRICETABLE to update the prices like these:
12.350000
13.580000
Notice I don't want to ALTER the column, only round the values, thanks!
The following would work for MySQL, SQL Server, and Postgres:
UPDATE PRICESTABLE
SET PRICE = ROUND(PRICE, 2);
You might want to add a WHERE clause to the above update, unless you really want to apply it to the entire table. Also, an alternative here would be to keep all the original precision, and just call ROUND when you need to present the data.
Related
I have huge table where occasionally one column got not rounded values,
e.g. 16345.462500 instead of 16345.460000
I'm not that good in postgres - maybe it's possible to update table rounding those values?
I can't change field type, because some rows (cryptocurrencies) can contain not rounded numbers.
Easiest thing I can think about is PHP script to manually update all fields.
You can use the round function to round to N decimal places - in your case, 2:
UPDATE mytable
SET mycolumn = ROUND(mycolumn, 2)
Can I use addition in database?
For example: I have data inside database that is integer. It has a value of 5.
Is there a query that will add another 1 to that? So it will become 6.
Please help me I'm a beginner.
This is the most basic form of an update statement:
update the_table
set the_column = the_column + 1
where the_column = 5;
Note that the above will update all rows where the_colum has the value 5. You most probably want to change the where clause to something different, e.g. by selecting only a single row by using a condition on the primary key column(s) of the table.
Check the manual of your DBMS for details, e.g.: http://www.postgresql.org/docs/current/static/dml-update.html
So I'm trying to get a part of a value from a column and insert that part into another column - new column. BOTH columns are in the same table. So what i want should look something like this:
id newColumn oldColumn
1 12 123 some text
2 24 246 some text
....
I know how to get 12 and 24 using SUBSTR, but how do i enter the data for each row in the table. Should i be using self-join or something else?
First you have to add new col using following command:-
ALTER TABLE TAB_NAME
ADD COLUMN COL_NAME(VARCHAR(10));
After that execute this command:-
UPDAET TAB_NAME
SET COL_NAME = SUBSTRING(OLDCOLUMN, 1, 2);
I think this might help you.
No need to join, it's just a plain UPDATE:
update tablename set newColumn = substring(oldColumn from 1 for 2)
substring is ANSI SQL, some dbms have substr and other versions.
The question is why you are doing this? What do you expect to find in newColumn if someone later updates oldColumn to another value? Maybe you should have a view instead, where newColumn always has up to date values?
Please get into the habit of ALWAYS specifying the DB engine you are using... It helps us to help you - we can provide more relevant answers.
You might want to consider using a calculated column as opposed to storing the information again.
In SQL Server you could do something like this
ALTER TABLE YourTable
ADD new_column as SUBSTRING(old_column, 1, 2);
This way you don't need to insert or update this column it is always consistent with the original column. and you just use it in your select statement in the usual way.
select new_column from YourTable
I am in a situation where I am having to update about 12,000 items in my DB.
Each row needs to mirror an excel file that I made previously.
I have made the file that creates each line of SQL statement, but I am not sure if I can run each line in a single query.
This is an example of what I am trying to do.
UPDATE [STORESQL].[dbo].[RPT_ITM_D] SET F1301='1.29' WHERE F01='0000000000001'
UPDATE [STORESQL].[dbo].[RPT_ITM_D] SET F1301='1.39' WHERE F01='0000000000002'
Will this work, or are there any better options for what I am trying to achieve?
Each item will have a unique value and the column to be changed will have a unique value as well. I don't see how I could make this work with a loop, or any other methods I've found so far. I realize that this might take a long time to process, but time is not an issue.
Thank you in advance
Something like this is the best you can do:-
UPDATE [STORESQL].[dbo].[RPT_ITM_D]
SET F1301 =
case F01
when '0000000000001' then '1.29'
when '0000000000002' then '1.30'
ELSE F1301
end
Other than that, running multiple updates is the way to go.
Yes, you could add all the single-line-Update-statements in one query like you are doing.
Take a look at MERGE e.g. something like:
MERGE INTO [STORESQL].[dbo].[RPT_ITM_D]
USING (
VALUES ('1.29', '0000000000001'),
('1.39', '0000000000002')
) AS source (F1301, F01)
ON F01 = source.F01
WHEN MATCHED THEN
UPDATE
SET F1301 = source.F1301;
...but using a table value constructor in this way would not scale to 12,000 rows! So look to first copying the data from Excel to a table on the server, then use the table as the source e.g.
MERGE INTO [STORESQL].[dbo].[RPT_ITM_D]
USING [STORESQL].[dbo].MyStagingTable AS source
ON F01 = source.F01
WHEN MATCHED THEN
UPDATE
SET F1301 = source.F1301;
If you have a significant amount of data to update, it may be advantageous to load the excel file into the database as a table, then update your table based on the data in this loaded table.
UPDATE RPT_ITM_D
SET F1301 = NewTable.Value
FROM RPT_ITM_D INNER JOIN NewTable ON (NewTable.F01 = RPT_ITEM_D.F01);
If you're on SQL server, you could use SSIS to load the file pretty quickly.
I think the best way is to import the Excel sheet into a table in your SQL database. From there you could be able to use a join to create a single update statement for all 12,000 items.
For information on how to import Excel sheet into SQL: http://msdn.microsoft.com/en-us/library/ms141209.aspx
The update statement would then look something like this:
UPDATE itemTable
SET F1301 = excelTable.<column with your value>
FROM [STORESQL].[dbo].[RPT_ITM_D] itemTable inner join [STORESQL].[dbo].[importedExcelTableName] excelTable on itemTable.F01 = excelTable.<column with the item code>
If you aren't sure if this would work safely, you can try this query for a single value by simple adding:
WHERE itemTable.F01 = '0000000000001'
You can use the concatenate function in Excel to frame a query, All you need to do is to frame a single update query and drag the same for the rest
concatenate("Update set =",,",where =
",,";")
Use the above format and drag the cell till the end or double click on the bottom right corner for Auto fill of the Update statement. I beleive this is the shortest way possible and run it in a single Go.
Make a unique constraint on the F01 column and then use an insert statement with an 'ON DUPLICATE KEY UPDATE' statement.
INSERT INTO [STORESQL].[dbo].[RPT_ITM_D] (F01, F1301)
VALUES
('0000000000001','1.29'),
('0000000000002','1.39')
ON DUPLICATE KEY UPDATE F1301 = VALUES(F1301);
I have created a lookup table in Access to provide the possible values for a column. Now I need to update this column with the data it had before I converted the column. I am unable to figure out a SQL Query that will work. I keep getting the error "An UPDATE or DELETE query cannot contain a multi-valued field." My research has suggested that I just need to set the value of the column but this always updates 0 records:
UPDATE [table_name] SET [column_name].Value = 55 WHERE [table_name].ID = 16;
I know this query will work if I change it to update a text column, so it is definitely a problem with just this column.
If you're adding a value to your multi-valued field, use an append query.
INSERT INTO table_name( [column_name].Value )
VALUES (55)
WHERE ID = 16;
If you want to change one particular value which exists in your multi-valued field, use an UPDATE statement. For example, to change the 55 to 56 ...
UPDATE [table_name]
SET [column_name].Value = 56
WHERE [column_name].Value = 55 And ID = 16;
See Using multivalued fields in queries for more information.
I have figured this out! It certainly was counter-intuitive! You have to use an INSERT statement to do the update.
-- Update a record with a multi-valued field that has no value
INSERT INTO [table_name] ( [[column_name].[Value] )
VALUES(55)
WHERE [table_name].ID = 16;
This confused me because I was expecting an UPDATE statement. I think it actually inserts a record into a hidden table that is used to associate multiple values with this column.
I am working with Sharepoint, I created the tables as multi-value fields, ran into the error with my INSERT INTO statement, went back to Sharepoint to change to non-multi-value fields, but that didn't fix it.
Recreated the table without using multi-value fields, and the INSERT INTO worked just fine.
do not use the .value part
UPDATE [table_name] SET [column_name] = 55 WHERE [table_name].ID = 16;
INSERT INTO Quals (cTypes.[value])
SELECT Quals_ContractTypes.ContractType
FROM Quals_ContractTypes
WHERE (Quals.ID = Quals_ContractTypes.ID_Quals);
I gotta say I didn't understand very well your problem but I saw something strange in your query. Try this:
UPDATE [table_name] SET [column_name]= 55 WHERE [table_name].ID = 16;
UPDATE:
Look at this link: it has an example
UPDATE Issues
SET Issues.AssignedTo.Value = 10
WHERE (((Issues.AssignedTo.Value)=6)
AND ((Issues.ID)=8));
NOTES
You should always include a WHERE
clause that identifies only the
records that you want to update.
Otherwise, you will update records
that you did not intend to change. An
Update query that does not contain a
WHERE clause changes every row in the
table. You can specify one value to
change.
The Multi-Valued field refers to Access databases that have tables with columns, that allow you to select multiple values, like a Combo Checkbox list.
THOSE are the only Access types that SQL cannot work with. I've tested all Access lookup possibilities, including hard-coded values, and lookup tables. They work fine, but if you have a column that has the Allow Multiple select options, you're out of luck. Even using the INSERT INTO as mentioned below, will not work as you'll get a similar but different error, about INSERTing into multi-valued fields.
As mentioned it's best to avoid using such tables outside of Access, and refer to a table specifically for your external needs. Then write a macro/vba script to update the real tables with the data from the "auxiliary" table.