I have 3 tables. I want to add corresponding values from second table and third table to the first table in the picture below. Each table has an ID by which they can be matched, ... field in the pictures. The first table has 1531 rows with an ID column and 8 other columns. This table, the top table in the pictures, is almost full of zeroes.
I have tried to join the tables in different ways but the problem is that each table has different number of rows and hence different number unique IDs. The top table has all IDs.
Is there some convenient way to add the second table to the first table and then the third table to that result?
Result of Left Join as suggested Suzena: why do the numbers not get summed up together?
Method1: Joins
select a.id,(a.col1 + b.col1+c.col1) as col1, (a.col2 + b.col2 + c.col2) as col2, (a.col3 + b.col3 + c.col3) as col3
from
table1 a
left join
table2 b
on a.id = b.id
left join
table3 c
on a.id = c.id;
Method2: Unions
select id,sum(col1) col1, sum(col2) col2, sum(col3) col3
from
(
select id,col1,col2,col3
from table1
union all
select id,col1,col2,col3
from table2
union all
select id,col1,col2,col3
from table3
) t
group by id
Let me know if you have any different criteria.
Method 3: having different number of fields so use NULL or 0
SELECT
[MID],
SUM([KEVAT 201501-04]) AS 'KEVAT 201501-04',
SUM([KESA 201504-06]) AS 'KESA 201504-06',
SUM([SYKSY 201507-09]) AS 'SYKSY 201507-09',
SUM([TALVI 201510-12]) AS 'TALVI 201510-12',
SUM([KEVAT 201601-04]) AS 'KEVAT 201601-04',
SUM([KESA 201604-06]) AS 'KESA 201604-06',
SUM([SYKSY 201607-09]) AS 'SYKSY 201607-09',
SUM([TALVI 201610-12]) AS 'TALVI 201610-12'
FROM
(
SELECT * FROM TABLE1
UNION ALL
SELECT [MID]
,0 AS 'KEVAT 201501-04'
,0 AS 'KESA 201504-06'
,0 AS 'SYKSY 201507-09'
,0 AS 'TALVI 201510-12'
,[KEVAT 201601-04]
,[KESA 201604-06]
,[SYKSY 201607-09]
,[TALVI 201610-12]
FROM TABLE2
UNION ALL
SELECT [MID]
,[KEVAT 201501-04]
,[KESA 201504-06]
,[SYKSY 201507-09]
,[TALVI 201510-12]
,0 AS 'KEVAT 201601-04'
,0 AS 'KESA 201604-06'
,0 AS 'SYKSY 201607-09'
,0 AS 'TALVI 201610-12'
FROM TABLE3
) a
GROUP BY [MID]
If i understand your question, you could use an union. Something like:
insert into table1(col1,col2,col3,col4)
(select col1,col2,col3,col4 from table2 union
select col1,col2,col3,col4 from table3)
The names of the columns of table2 and table3 must match. Use alias for that.
Try using MERGE
--Get data from table 2 and merge into table 1
MERGE Table_1 AS TARGET
USING (SELECT [ID]
,[KEVAT 201501-04]
,[KESA 201504-06]
,[SYKSY 201507-09]
,[TALVI 201510-12] FROM Table_2) AS SOURCE
ON (TARGET.ID = SOURCE.ID)
WHEN MATCHED
THEN UPDATE SET
TARGET.[KEVAT 201501-04] = SOURCE.[KEVAT 201501-04],
TARGET.[KESA 201504-06] = SOURCE.[KESA 201504-06],
TARGET.[SYKSY 201507-09] = SOURCE.[SYKSY 201507-09],
TARGET.[TALVI 201510-12] = SOURCE.[TALVI 201510-12];
GO
--Get data from table 3 and merge into table 1
MERGE Table_1 AS TARGET
USING (SELECT [ID]
,[KEVAT 201601-01]
,[KESA 201604-06]
,[SYKSY 201607-09]
,[TALVI 201610-12] FROM Table_3) AS SOURCE
ON (TARGET.ID = SOURCE.ID)
WHEN MATCHED
THEN UPDATE SET
TARGET.[KEVAT 201601-01] = SOURCE.[KEVAT 201601-01],
TARGET.[KESA 201604-06] = SOURCE.[KESA 201604-06],
TARGET.[SYKSY 201607-09] = SOURCE.[SYKSY 201607-09],
TARGET.[TALVI 201610-12] = SOURCE.[TALVI 201610-12];
GO
I have this query in oracle:
select * from table where col2 in (1,2,3,4);
lets say I got this result
col1 | col2
-----------
a 1
b 2
My 'in (1,2,3,4)' part has like 20 or more options, how can I determinate which values I don't found in my table? in my example 3 and 4 doesn't exist in the table
You can't in the way you want.
You need to insert the values you want to find into a table and than select all the values which don't exist in the desired table.
Lets say the data you want to find is in A and you want to know which doesn't exist in B.
SELECT *
FROM table_a A
WHERE NOT EXISTS (SELECT *
FROM table_b B
WHERE B.col1 = A.col1);
IN lists are stupid, or at least not very useful. Use a SQL Type collection to store your values instead because we can turn them into tables.
In this example I'm using the obscure SYS.KU$_OBJNUMSET type, which is the only nested table of Number I know of on 10g. (There's lots more in 11g).
So
select t.column_value
from table ( SYS.KU$_OBJNUMSET (1,2,3,4) ) t
left join your_table
on col2 = t.column_value
where col2 is null;
Here would be a way to do it if you're just using integers for your specific example:
SELECT *
FROM (
Select Rownum r
From dual
Connect By Rownum IN (1,2,3,4)
) T
LEFT JOIN YourTable T2 ON T.r = T2.Col2
WHERE T2.Col2 IS NULL
And the Fiddle.
This creates a table out of your where criteria 1,2,3,4 and uses that to LEFT JOIN on.
--EDIT
Because values aren't ints, here is another "ugly" option:
SELECT *
FROM (
Select 'a' r From dual UNION
Select 'b' r From dual UNION
Select 'c' r From dual UNION
Select 'd' r From dual
) T
LEFT JOIN YourTable T2 ON T.r = T2.Col2
WHERE T2.Col2 IS NULL
http://www.sqlfiddle.com/#!4/5e769/2
Good luck.
In SQL Server, it is possible to insert rows into a table with an INSERT.. SELECT statement:
INSERT INTO Table (col1, col2, col3)
SELECT col1, col2, col3
FROM other_table
WHERE sql = 'cool'
Is it also possible to update a table with SELECT? I have a temporary table containing the values and would like to update another table using those values. Perhaps something like this:
UPDATE Table SET col1, col2
SELECT col1, col2
FROM other_table
WHERE sql = 'cool'
WHERE Table.id = other_table.id
UPDATE
Table_A
SET
Table_A.col1 = Table_B.col1,
Table_A.col2 = Table_B.col2
FROM
Some_Table AS Table_A
INNER JOIN Other_Table AS Table_B
ON Table_A.id = Table_B.id
WHERE
Table_A.col3 = 'cool'
In SQL Server 2008 (or newer), use MERGE
MERGE INTO YourTable T
USING other_table S
ON T.id = S.id
AND S.tsql = 'cool'
WHEN MATCHED THEN
UPDATE
SET col1 = S.col1,
col2 = S.col2;
Alternatively:
MERGE INTO YourTable T
USING (
SELECT id, col1, col2
FROM other_table
WHERE tsql = 'cool'
) S
ON T.id = S.id
WHEN MATCHED THEN
UPDATE
SET col1 = S.col1,
col2 = S.col2;
UPDATE YourTable
SET Col1 = OtherTable.Col1,
Col2 = OtherTable.Col2
FROM (
SELECT ID, Col1, Col2
FROM other_table) AS OtherTable
WHERE
OtherTable.ID = YourTable.ID
I'd modify Robin's excellent answer to the following:
UPDATE Table
SET Table.col1 = other_table.col1,
Table.col2 = other_table.col2
FROM
Table
INNER JOIN other_table ON Table.id = other_table.id
WHERE
Table.col1 != other_table.col1
OR Table.col2 != other_table.col2
OR (
other_table.col1 IS NOT NULL
AND Table.col1 IS NULL
)
OR (
other_table.col2 IS NOT NULL
AND Table.col2 IS NULL
)
Without a WHERE clause, you'll affect even rows that don't need to be affected, which could (possibly) cause index recalculation or fire triggers that really shouldn't have been fired.
One way
UPDATE t
SET t.col1 = o.col1,
t.col2 = o.col2
FROM
other_table o
JOIN
t ON t.id = o.id
WHERE
o.sql = 'cool'
Another possibility not mentioned yet is to just chuck the SELECT statement itself into a CTE and then update the CTE.
WITH CTE
AS (SELECT T1.Col1,
T2.Col1 AS _Col1,
T1.Col2,
T2.Col2 AS _Col2
FROM T1
JOIN T2
ON T1.id = T2.id
/*Where clause added to exclude rows that are the same in both tables
Handles NULL values correctly*/
WHERE EXISTS(SELECT T1.Col1,
T1.Col2
EXCEPT
SELECT T2.Col1,
T2.Col2))
UPDATE CTE
SET Col1 = _Col1,
Col2 = _Col2;
This has the benefit that it is easy to run the SELECT statement on its own first to sanity check the results, but it does requires you to alias the columns as above if they are named the same in source and target tables.
This also has the same limitation as the proprietary UPDATE ... FROM syntax shown in four of the other answers. If the source table is on the many side of a one-to-many join then it is undeterministic which of the possible matching joined records will be used in the Update (an issue that MERGE avoids by raising an error if there is an attempt to update the same row more than once).
For the record (and others searching like I was), you can do it in MySQL like this:
UPDATE first_table, second_table
SET first_table.color = second_table.color
WHERE first_table.id = second_table.foreign_id
Using alias:
UPDATE t
SET t.col1 = o.col1
FROM table1 AS t
INNER JOIN
table2 AS o
ON t.id = o.id
The simple way to do it is:
UPDATE
table_to_update,
table_info
SET
table_to_update.col1 = table_info.col1,
table_to_update.col2 = table_info.col2
WHERE
table_to_update.ID = table_info.ID
This may be a niche reason to perform an update (for example, mainly used in a procedure), or may be obvious to others, but it should also be stated that you can perform an update-select statement without using join (in case the tables you're updating between have no common field).
update
Table
set
Table.example = a.value
from
TableExample a
where
Table.field = *key value* -- finds the row in Table
AND a.field = *key value* -- finds the row in TableExample a
Here is another useful syntax:
UPDATE suppliers
SET supplier_name = (SELECT customers.name
FROM customers
WHERE customers.customer_id = suppliers.supplier_id)
WHERE EXISTS (SELECT customers.name
FROM customers
WHERE customers.customer_id = suppliers.supplier_id);
It checks if it is null or not by using "WHERE EXIST".
I add this only so you can see a quick way to write it so that you can check what will be updated before doing the update.
UPDATE Table
SET Table.col1 = other_table.col1,
Table.col2 = other_table.col2
--select Table.col1, other_table.col,Table.col2,other_table.col2, *
FROM Table
INNER JOIN other_table
ON Table.id = other_table.id
If you use MySQL instead of SQL Server, the syntax is:
UPDATE Table1
INNER JOIN Table2
ON Table1.id = Table2.id
SET Table1.col1 = Table2.col1,
Table1.col2 = Table2.col2
UPDATE from SELECT with INNER JOIN in SQL Database
Since there are too many replies of this post, which are most heavily up-voted, I thought I would provide my suggestion here too. Although the question is very interesting, I have seen in many forum sites and made a solution using INNER JOIN with screenshots.
At first, I have created a table named with schoolold and inserted few records with respect to their column names and execute it.
Then I executed SELECT command to view inserted records.
Then I created a new table named with schoolnew and similarly executed above actions on it.
Then, to view inserted records in it, I execute SELECT command.
Now, Here I want to make some changes in third and fourth row, to complete this action, I execute UPDATE command with INNER JOIN.
To view the changes I execute the SELECT command.
You can see how Third and Fourth records of table schoolold easily replaced with table schoolnew by using INNER JOIN with UPDATE statement.
And if you wanted to join the table with itself (which won't happen too often):
update t1 -- just reference table alias here
set t1.somevalue = t2.somevalue
from table1 t1 -- these rows will be the targets
inner join table1 t2 -- these rows will be used as source
on .................. -- the join clause is whatever suits you
Updating through CTE is more readable than the other answers here:
;WITH cte
AS (SELECT col1,col2,id
FROM other_table
WHERE sql = 'cool')
UPDATE A
SET A.col1 = B.col1,
A.col2 = B.col2
FROM table A
INNER JOIN cte B
ON A.id = B.id
The following example uses a derived table, a SELECT statement after the FROM clause, to return the old and new values for further updates:
UPDATE x
SET x.col1 = x.newCol1,
x.col2 = x.newCol2
FROM (SELECT t.col1,
t2.col1 AS newCol1,
t.col2,
t2.col2 AS newCol2
FROM [table] t
JOIN other_table t2
ON t.ID = t2.ID) x
If you are using SQL Server you can update one table from another without specifying a join and simply link the two from the where clause. This makes a much simpler SQL query:
UPDATE Table1
SET Table1.col1 = Table2.col1,
Table1.col2 = Table2.col2
FROM
Table2
WHERE
Table1.id = Table2.id
Consolidating all the different approaches here.
Select update
Update with a common table expression
Merge
Sample table structure is below and will update from Product_BAK to Product table.
Table Product
CREATE TABLE [dbo].[Product](
[Id] [int] IDENTITY(1, 1) NOT NULL,
[Name] [nvarchar](100) NOT NULL,
[Description] [nvarchar](100) NULL
) ON [PRIMARY]
Table Product_BAK
CREATE TABLE [dbo].[Product_BAK](
[Id] [int] IDENTITY(1, 1) NOT NULL,
[Name] [nvarchar](100) NOT NULL,
[Description] [nvarchar](100) NULL
) ON [PRIMARY]
1. Select update
update P1
set Name = P2.Name
from Product P1
inner join Product_Bak P2 on p1.id = P2.id
where p1.id = 2
2. Update with a common table expression
; With CTE as
(
select id, name from Product_Bak where id = 2
)
update P
set Name = P2.name
from product P inner join CTE P2 on P.id = P2.id
where P2.id = 2
3. Merge
Merge into product P1
using Product_Bak P2 on P1.id = P2.id
when matched then
update set p1.[description] = p2.[description], p1.name = P2.Name;
In this Merge statement, we can do insert if not finding a matching record in the target, but exist in the source and please find syntax:
Merge into product P1
using Product_Bak P2 on P1.id = P2.id;
when matched then
update set p1.[description] = p2.[description], p1.name = P2.Name;
WHEN NOT MATCHED THEN
insert (name, description)
values(p2.name, P2.description);
The other way is to use a derived table:
UPDATE t
SET t.col1 = a.col1
,t.col2 = a.col2
FROM (
SELECT id, col1, col2 FROM #tbl2) a
INNER JOIN #tbl1 t ON t.id = a.id
Sample data
DECLARE #tbl1 TABLE (id INT, col1 VARCHAR(10), col2 VARCHAR(10))
DECLARE #tbl2 TABLE (id INT, col1 VARCHAR(10), col2 VARCHAR(10))
INSERT #tbl1 SELECT 1, 'a', 'b' UNION SELECT 2, 'b', 'c'
INSERT #tbl2 SELECT 1, '1', '2' UNION SELECT 2, '3', '4'
UPDATE t
SET t.col1 = a.col1
,t.col2 = a.col2
FROM (
SELECT id, col1, col2 FROM #tbl2) a
INNER JOIN #tbl1 t ON t.id = a.id
SELECT * FROM #tbl1
SELECT * FROM #tbl2
UPDATE TQ
SET TQ.IsProcessed = 1, TQ.TextName = 'bla bla bla'
FROM TableQueue TQ
INNER JOIN TableComment TC ON TC.ID = TQ.TCID
WHERE TQ.IsProcessed = 0
To make sure you are updating what you want, select first
SELECT TQ.IsProcessed, 1 AS NewValue1, TQ.TextName, 'bla bla bla' AS NewValue2
FROM TableQueue TQ
INNER JOIN TableComment TC ON TC.ID = TQ.TCID
WHERE TQ.IsProcessed = 0
There is even a shorter method and it might be surprising for you:
Sample data set:
CREATE TABLE #SOURCE ([ID] INT, [Desc] VARCHAR(10));
CREATE TABLE #DEST ([ID] INT, [Desc] VARCHAR(10));
INSERT INTO #SOURCE VALUES(1,'Desc_1'), (2, 'Desc_2'), (3, 'Desc_3');
INSERT INTO #DEST VALUES(1,'Desc_4'), (2, 'Desc_5'), (3, 'Desc_6');
Code:
UPDATE #DEST
SET #DEST.[Desc] = #SOURCE.[Desc]
FROM #SOURCE
WHERE #DEST.[ID] = #SOURCE.[ID];
Use:
drop table uno
drop table dos
create table uno
(
uid int,
col1 char(1),
col2 char(2)
)
create table dos
(
did int,
col1 char(1),
col2 char(2),
[sql] char(4)
)
insert into uno(uid) values (1)
insert into uno(uid) values (2)
insert into dos values (1,'a','b',null)
insert into dos values (2,'c','d','cool')
select * from uno
select * from dos
EITHER:
update uno set col1 = (select col1 from dos where uid = did and [sql]='cool'),
col2 = (select col2 from dos where uid = did and [sql]='cool')
OR:
update uno set col1=d.col1,col2=d.col2 from uno
inner join dos d on uid=did where [sql]='cool'
select * from uno
select * from dos
If the ID column name is the same in both tables then just put the table name before the table to be updated and use an alias for the selected table, i.e.:
update uno set col1 = (select col1 from dos d where uno.[id] = d.[id] and [sql]='cool'),
col2 = (select col2 from dos d where uno.[id] = d.[id] and [sql]='cool')
In the accepted answer, after the:
SET
Table_A.col1 = Table_B.col1,
Table_A.col2 = Table_B.col2
I would add:
OUTPUT deleted.*, inserted.*
What I usually do is putting everything in a roll backed transaction and using the "OUTPUT": in this way I see everything that is about to happen. When I am happy with what I see, I change the ROLLBACK into COMMIT.
I usually need to document what I did, so I use the "results to Text" option when I run the roll-backed query and I save both the script and the result of the OUTPUT. (Of course this is not practical if I changed too many rows)
UPDATE table AS a
INNER JOIN table2 AS b
ON a.col1 = b.col1
INNER JOIN ... AS ...
ON ... = ...
SET ...
WHERE ...
The below solution works for a MySQL database:
UPDATE table1 a , table2 b
SET a.columname = 'some value'
WHERE b.columnname IS NULL ;
The other way to update from a select statement:
UPDATE A
SET A.col = A.col,B.col1 = B.col1
FROM first_Table AS A
INNER JOIN second_Table AS B ON A.id = B.id WHERE A.col2 = 'cool'
Option 1: Using Inner Join:
UPDATE
A
SET
A.col1 = B.col1,
A.col2 = B.col2
FROM
Some_Table AS A
INNER JOIN Other_Table AS B
ON A.id = B.id
WHERE
A.col3 = 'cool'
Option 2: Co related Sub query
UPDATE table
SET Col1 = B.Col1,
Col2 = B.Col2
FROM (
SELECT ID, Col1, Col2
FROM other_table) B
WHERE
B.ID = table.ID
UPDATE table1
SET column1 = (SELECT expression1
FROM table2
WHERE conditions)
[WHERE conditions];
The syntax for the UPDATE statement when updating one table with data from another table in SQL Server.
It is important to point out, as others have, that MySQL or MariaDB use a different syntax. Also it supports a very convenient USING syntax (in contrast to T/SQL). Also INNER JOIN is synonymous with JOIN. Therefore the query in the original question would be best implemented in MySQL thusly:
UPDATE
Some_Table AS Table_A
JOIN
Other_Table AS Table_B USING(id)
SET
Table_A.col1 = Table_B.col1,
Table_A.col2 = Table_B.col2
WHERE
Table_A.col3 = 'cool'
I've not seen the a solution to the asked question in the other answers, hence my two cents.
(tested on PHP 7.4.0 MariaDB 10.4.10)