I want to update one table using another table on field "Id" such that it wont create duplicates
let say my first table is Table1 and second table is Table2 . I would like to update the row in Table1 from Table2 when the Id is matching
I am aware of using UNION function but this applies to entire columns where I only need to consider a single column. https://docs.snowflake.com/en/sql-reference/operators-query.html#union-all
Example of my Tables
Table1
Id name number value
1 a 8 100
2 b 8 100
3 c 8 100
4 d 8 100
Table2
Id name number value
3 c 8 99
4 d 6 100
5 e 7 100
Expected output
Id name number value
1 a 8 100
2 b 8 100
3 c 8 99
4 d 6 100
5 e 7 100
Please note that in the output table row with Id 3,4 has be updated and new Id 5 is inserted.
PS: It would be better if someone could provide me the select statement to get the output table.
The constuct you are searching for is called MERGE:
CREATE OR REPLACE TABLE trg(Id INT, name VARCHAR, number INT, value INT)
AS SELECT 1 ,'a', 8, 100
UNION SELECT 2 ,'b', 8, 100
UNION SELECT 3 ,'c', 8, 100
UNION SELECT 4 ,'d', 8, 100;
CREATE OR REPLACE TABLE src(Id INT, name VARCHAR, number INT, value INT)
AS SELECT 3 ,'c', 8, 99
UNION SELECT 4 ,'d', 6, 100
UNION SELECT 5 ,'e', 7, 100;
Query:
MERGE INTO trg
USING src
ON trg.Id = src.Id
WHEN MATCHED THEN UPDATE SET name = src.name,
number = src.number,
value = src.value
WHEN NOT MATCHED THEN INSERT (ID, name, number, value)
VALUES (src.Id, src.name, src.number, src.value);
SELECT * FROM trg;
Output:
EDIT:
PS: It would be better if someone could provide me the select statement to get the output table.
UNION ALL combined with QUALIFY could be used:
WITH cte AS (
SELECT *, 1 AS priority FROM trg
UNION ALL
SELECT *, 0 AS priority FROM src
)
SELECT Id, Name, Number, Value
FROM cte
QUALIFY ROW_NUMBER() OVER(PARTITION BY ID ORDER BY Priority) = 1
ORDER BY Id;
Related
suppose I have 100000 records in A table and 1000 records in B table. both have primary/foreign key relationship. now i want to update a column value for first 100 records in table A with column value from table B first record. similary i want to update all the 100000 records in table A as a batch 100 records for 1000 times with values from table B.
no. of records updated per batch is 100 i.e. 100000/1000=100
Lets assume you have table_a with 20 rows with a unique id column and you want to update the value column:
CREATE TABLE table_a (id, value) AS
SELECT LEVEL, CAST(NULL AS NUMBER(8,0)) FROM DUAL CONNECT BY LEVEL <= 20;
And table_b with 5 rows containing the values you want to update from:
CREATE TABLE table_b (id, value) AS
SELECT LEVEL, LEVEL FROM DUAL CONNECT BY LEVEL <= 5;
Then, you can use a correlated UPDATE statement:
UPDATE table_a a
SET value = (SELECT value
FROM table_b b
WHERE CEIL(a.id*5/20) = b.id);
or a MERGE statement:
MERGE INTO table_a a
USING table_b b
ON (CEIL(a.id*5/20) = b.id)
WHEN MATCHED THEN
UPDATE
SET value = b.value;
Both statements result in:
ID
VALUE
1
1
2
1
3
1
4
1
5
2
6
2
7
2
8
2
9
3
10
3
11
3
12
3
13
4
14
4
15
4
16
4
17
5
18
5
19
5
20
5
db<>fiddle here
How to select the value from the table based on category_id?
I have a table like this. Please help me.
Table A
ID Name category_id
-------------------
1 A 1
2 A 1
3 B 1
4 C 2
5 C 2
6 D 2
7 E 3
8 E 3
9 F 3
How to get the below mentioned output from table A?
ID Name category_id
--------------------
1 A 1
2 A 1
4 C 2
5 C 2
7 E 3
8 E 3
Give a row number for each row based on group by category_id and sort by ascending order of ID. Then select the rows having row number 1 and 2.
Query
;with cte as (
select [rn] = row_number() over(
partition by [category_id]
order by [ID]
), *
from [your_table_name]
)
select [ID], [Name], [category_id]
from cte
where [rn] < 3;
Kindly run this query It really help You Out.
SELECT tbl.id,tbl.name, tbl.category_id FROM TableA as tbl WHERE
tbl.name IN(SELECT tbl2.name FROM TableA tbl2 GROUP BY tbl2.name HAVING Count(tbl2.name)> 1)
Code select all category_id from TableA which has Name entries more then one. If there is single entry of any name group by category_id then such data will be excluded. In above example questioner want to eliminate those records that have single Name entity like wise category_id 1 has name entries A and B among which A has two entries and B has single entry so he want to eliminate B from result set.
I am new to the recursive CTE concept and a problem at hand, I got a tiny feeling that the problem can be solved by using recursive CTE. Let me know what you guys think.
Two tables:
Table one is a self referencing Location table with ID, ParentID, Level and Description.
Table two is an asset table which records individual assets and has a foreign key to Location table ID field.
Table1:
ID Description ParentID Level
1 Site1 NULL 1
2 Site2 NULL 1
3 Building1 1 2
4 Building2 1 2
5 Floor1 3 3
6 Floor2 3 3
7 Floor3 4 3
8 Place1 5 4
9 Place2 7 4
Table2:
ID Description Quantity LocationID
1 Desk 3 8
2 Lamp 1 8
3 PC 10 9
I would like to create a stored procedure with a input parameter of #Level and returns all the Location records at that level and the number of assets within the location (including sub levels).
For example, if #Level = 3, the stored procedure should return:
ID Description AssetCount
5 Floor1 4
6 Floor2 0
7 Floor3 10
If #Level = 2, the stored procedure should return:
ID Description AssetCount
3 Building1 4
4 Building2 10
If the problem is not clear, please let me know.
Well, nothing special here, just a recursive CTE joined with the other table, and the results are what you expected:
declare #level int = 3
;with CTE as (
select id as origid, id, Description, parentid
from table1 where level = #level
union all
select CTE.origid, t1.id, CTE.Description, t1.parentid
from CTE join table1 t1 on
CTE.id = t1.parentid
)
select origid, CTE.description, isnull(sum(t2.Quantity),0) as Quantity
from CTE left outer join table2 t2 on CTE.id = t2.locationid
group by origid, CTE.description
SQL Fiddle
I apologize in advance I feel like I'm missing something really stupid simple. (and let's ignore database structure as I'm kind of locked into that).
I have, let's use customer orders - an order number can be shipped to more than one place. For the sake of ease I'm just illustrating three but it could be more than that (home, office, gift, gift2, gift 3, etc)
So my table is:
Customer orders:
OrderID MailingID
--------------------
1 1
1 2
1 3
2 1
3 1
3 3
4 1
4 2
4 3
What I need to find is OrderIDs that have been shipped to MailingID 1 but not 2 (basically what I need to find is orderID 2 and 3 above).
If it matters, I'm using Sql Express 2012.
Thanks
Maybe this could help:
create table #temp(
orderID int,
mailingID int
)
insert into #temp
select 1, 1 union all
select 1, 2 union all
select 1, 3 union all
select 2, 1 union all
select 3, 1 union all
select 3, 3 union all
select 4, 1 union all
select 4, 2 union all
select 4, 3
-- find orderIDs that have been shipeed to mailingID = 1
select
distinct orderID
from #temp
where mailingID = 1
except
-- find orderIDs that have been shipeed to mailingID = 2
select
orderID
from #temp
where mailingID = 2
drop table #temp
A simple Subquery With NOT IN Operator should work.
SELECT DISTINCT OrderID
FROM <tablename> a
WHERE orderid NOT IN (SELECT orderid
FROM <tablename> b
WHERE b.mailingID = 2)
I have a table with 10 rows
id values
1 a
2 b
3 c
4 d
5 e
6 f
7 g
8 h
9 i
10 j
I want to get two rows before and two rows after for #id = 5.
How can get?
Edit This should work as expected (hopefully):
select id, value
from [table]
where id-#id >= -2
AND id-#id <= 2
AND id-#id <> 0
Here's the running sql: http://sqlfiddle.com/#!6/ca4e5/3/0
One possible solution:
select *
from table
where id in (3, 4, 6, 7)
If you are using a int variable #id, you can do it like this:
select *
from table
where id in (#id-2, #id-1, #id+1, #id+2)
To select the previous two:
select top 2 *
from tablename
where id < #id
order by id desc
To select the next two:
select top 2 *
from tablename
where id > #id
order by id asc