I have doc_no, I need to find out its type. So I need to select a query from the table.
SELECT o.type_id
FROM operation_out o
WHERE o.doc_no = 17025337;
But what to do, if I have 3 different tables
operation_out, operation_in, operation_reverse
and given doc_no can be in any of the given tables.
I have already tried union:
SELECT transfer_type_id
FROM (SELECT doc_no, mt_o.type_id
FROM mt_operation_out mt_o
UNION ALL
SELECT doc_no, mt_in.type_id
FROM mt_operation_in mt_in
UNION ALL
SELECT doc_no, mt_r.type_id
FROM mt_operation_reverse mt_r)
WHERE doc_no = 17025337;
Is there another alternative way of writing this? Is there any syntax in SQL for this kind of task?
Thank you all for your recommendations. In the end, I created a view based on the UNION ALL, and I'm going to use it wherever needed.
Related
Hypothetically I want to merge 2 tables from different databases into one table, which includes all the data from the 2 tables:
The result would look like something like this:
Aren't the entries in the result table redundant, because there are 2 entries with Porsche and VW? Or can I just add the values in the column 'stock' because the column 'Mark' is explicit?
you need to create database link to another database here is the example on how to create database link http://psoug.org/definition/create_database_link.htm
after creating your select statement from another database should look: select * from tableA#"database_link_name"
Then you need to use MERGE statement to push data from another database so the merge statement should look something like this.
you can read about merge statement here: https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9016.htm#SQLRF01606
merge into result_table res
using (select mark, stock, some_unique_id
from result_table res2
union all
select mark, stock, some_unique_id
from tableA#"database_link_name") diff
on (res.some_unique_id = diff.some_unique_id )
when matched then
update set res.mark = diff.mark,
res.stock = diff.stock
when not matched then
insert
(res.mark,
res.stock,
res.some_unique_id)
values
(diff.mark,
diff.stock,
diff.some_unique_id);
I hope this will help you
SELECT ROW_NUMBER() OVER (ORDER BY Mark) AS new_ID, Mark, SUM(Stock) AS Stock
FROM
(
SELECT Mark,Stock FROM Database1.dbo.table1
UNION ALL
SELECT Mark,Stock FROM Database2.dbo.table2
) RESULT
GROUP BY Mark
Try this:
Select Mark, Stock, row_number() over(order by Mark desc) from table1
union all
Select Mark, Stock, row_number() over(order by Mark desc) from table2
regardless of the data redundancy, you could use union all clause to achieve this. Like:
Select * From tableA
UNION ALL
Select * From tanleB
Make sure the total number of columns and datatype should be matched between each
Don't forget to use fully qualified table names as the tables are in different databases
SELECT
Mark
,Stock
FROM Database1.dbo.table1
UNION ALL
SELECT
Mark
,Stock
FROM Database2.dbo.table2
If these are 2 live databases and you would need to constantly include rows from the 2 databases into your new database consider writing the table in your 3rd database as a view rather.
This way you can also add a column specifying which system the datarow is coming from. Summing the values is an option, however if you ever have a query regarding a incorrect summed value how would you know which system is the culprit?
This question already has answers here:
Combine two tables for one output
(2 answers)
Closed 8 years ago.
I have two tables now I need a select or join command in SQL to have the third table just like image below
My two tables are like this:
I only know a simple things about join command in SQL, should I use join or something else?
I do not want have the third table in my database, I want that for a short time (something like virtual table). Please help !
You are actually looking for UNION or UNION ALL.
First of all, there is no condition on which to JOIN tables (review your documentation on JOIN) and JOIN is used for retrieving information about one logical element, let's say Event in your case, which has details stored in more tables.
Secondly, JOIN will make one result set with all of the columns of your two tables, when actually you are not trying to get all columns, but all rows.
For this you will have to use UNION or UNION ALL like this:
SELECT
EventID,
ID,
EventName,
Date,
Pic,
Privacy
FROM Table1
UNION ALL
SELECT
PLID AS EventID,
ID AS ID,
PlaceName AS EventName,
Date AS Date,
NULL AS Pic,
NULL AS Privacy
FROM Table2
In order to sort the result you get from the result set returned by the queries above you will need to wrap your above SELECT statements with another SELECT and use a WHERE clause at that level, like below:
SELECT *
FROM (SELECT
EventID,
ID,
EventName,
Date,
Pic,
Privacy
FROM Table1
UNION ALL
SELECT
PLID AS EventID,
ID AS ID,
PlaceName AS EventName,
Date AS Date,
NULL AS Pic,
NULL AS Privacy
FROM Table2) AS Result
WHERE Date > '2014-05-26'
What you're looking to do is a UNION or UNION ALL, not a join. See: http://www.w3schools.com/sql/sql_union.asp
UNION combines two tables without connecting their content. Your example shows all 4 records from the original tables unmodified.
A JOIN solution links the two tables. It's very common and you will probably use it if you're building a relational database, but it won't give you the example result.
Since the two tables don't have identical # of columns, you have to help it out here:
SELECT EventID, EventName, Date, Pic, privacy FROM [table 1]
UNION ALL
SELECT PLID, PlaceName, Date, null, null FROM [table 2]
You want to have one table from two different tables. So you need unified result set from each by renaming column in SELECT statement:
SELECT `EventID` AS `ObjectID`, `EventName` AS `ObjectName`, .... FROM table_1 ...
similary with table_2
Then combine to one result set:
SELECT `ID` AS `ObjectID`, `EventName` AS `ObjectName`, .... FROM table_1 ...
UNION
SELECT `PlaceID` AS `ObjectID`, `PlaceName` AS `ObjectName`, .... FROM table_2 ...
My mistake, I didn't take the time to examine the pictures fully. you would have to use Union since you want to return what is in both tables.
For examples I don't know how many rows in each table are and I try to do like this:
SELECT * FROM members
UNION
SELECT * FROM inventory
What can I put to the second SELECT instead of * to remove this error without adding NULL's?
Put the columns names explicitly rather than *, and make sure the number of columns and data types match for the same column in each select.
Update:
I really don't think you want to be UNIONing those tables, based on the tables names. They don't seem to contain related data. If you post your schema and describe what you are trying to achieve it is likely we can provide better help.
you could do
SELECT *
from members
UNION
SELECT inventory.*, 'dummy1' AS membersCol1, 'dummy2' AS membersCol2
from inventory;
Where membersCol1, membersCol12, etc... are the names of columns from members that are not in inventory. That way both queries in the union will have the same columns (Assuming that all the columns in inventory are the same as in members which seems very strange to me... but hey, it's your schema).
UPDATE:
As HLGEM pointed out, this will only work if inventory has columns with the same names as members, and in the same order. Naming all the columns explicitly is the best idea, but since I don't know the names I can't exactly do that. If I did, it might look something like this:
SELECT id, name, member_role, member_type
from members
UNION
SELECT id, name, '(dummy for union)' AS member_role, '(dummy for union)' AS member_type
from inventory;
I don't like using NULL for dummy values because then it's not always clear which part of the union a record came from - using 'dummy' makes it clear that the record is from the part of the union that didn't have that record (though sometimes this might not matter). The very idea of unioning these two tables seems very strange to me because I very much doubt they'd have more than 1 or 2 columns with the same name, but you asked the question in such a way that I imagine in your scenario this somehow makes sense.
Are you sure you don't want a join instead? It is unlikely that UNOIN will give you what you want given the table names.
Try this
(SELECT * FROM members) ;
(SELECT * FROM inventory);
Just add semicolons after both the select statements and don't use union or anything else. This solved my error.
I don't know how many rows in each table
Are you sure this isn't what you want?
SELECT 'members' AS TableName, Count(*) AS Cnt FROM members
UNION ALL
SELECT 'inventory', Count(*) FROM inventory
Each SELECT statement within the MySQL UNION ALL operator must have the same number of fields in the result sets with similar data types
Visit https://www.techonthenet.com/mysql/union_all.php
I want to check my database for records that I already have recorded before making a web service call.
Here is what I imagine the query to look like, I just can't seem to figure out the syntax.
SELECT *
FROM (1,2,3,4) as temp_table
WHERE temp_table.id
LEFT JOIN table ON id IS NULL
Is there a way to do this? What is a query like this called?
I want to pass in a list of id's to mysql and i want it to spit out the id's that are not already in the database?
Use:
SELECT x.id
FROM (SELECT #param_1 AS id
FROM DUAL
UNION ALL
SELECT #param_2
FROM DUAL
UNION ALL
SELECT #param_3
FROM DUAL
UNION ALL
SELECT #param_4
FROM DUAL) x
LEFT JOIN TABLE t ON t.id = x.id
WHERE x.id IS NULL
If you need to support a varying number of parameters, you can either use:
a temporary table to populate & join to
MySQL's Prepared Statements to dynamically construct the UNION ALL statement
To confirm I've understood correctly, you want to pass in a list of numbers and see which of those numbers isn't present in the existing table? In effect:
SELECT Item
FROM IDList I
LEFT JOIN TABLE T ON I.Item=T.ID
WHERE T.ID IS NULL
You look like you're OK with building this query on the fly, in which case you can do this with a numbers / tally table by changing the above into
SELECT Number
FROM (SELECT Number FROM Numbers WHERE Number IN (1,2,3,4)) I
LEFT JOIN TABLE T ON I.Number=T.ID
WHERE T.ID IS NULL
This is relatively prone to SQL Injection attacks though because of the way the query is being built. It'd be better if you could pass in '1,2,3,4' as a string and split it into sections to generate your numbers list to join against in a safer way - for an example of how to do that, see http://www.sqlteam.com/article/parsing-csv-values-into-multiple-rows
All of this presumes you've got a numbers / tally table in your database, but they're sufficiently useful in general that I'd strongly recommend you do.
SELECT * FROM table where id NOT IN (1,2,3,4)
I would probably just do:
SELECT id
FROM table
WHERE id IN (1,2,3,4);
And then process the list of results, removing any returned by the query from your list of "records to submit".
How about a nested query? This may work. If not, it may get you in the right direction.
SELECT * FROM table WHERE id NOT IN (
SELECT id FROM table WHERE 1
);
Currently I have 2 tables, both of the tables have the same structure and are going to be used in a web application. the two tables are production and temp. The temp table contains one additional column called [signed up]. Currently I generate a single list using two columns that are found in each table (recno and name). Using these two fields I'm able to support my web application search function. Now what I need to do is support limiting the amount of items that can be used in the search on the second table. the reason for this is become once a person is "signed up" a similar record is created in the production table and will have its own recno.
doing:
Select recno, name
from production
UNION ALL
Select recno, name
from temp
...will show me everyone. I have tried:
Select recno, name
from production
UNION ALL
Select recno, name
from temp
WHERE signup <> 'Y'
But this returns nothing? Can anyone help?
For what you are asking, you could do it this style.
SELECT * FROM
(
SELECT '1' as `col`
UNION
SELECT '2' as `col`
) as `someAlias`
where `someAlias`.`col` = '1'
Put the entire union inside parenthesis, give it an alias, then give the condition.
Not sure if I'm understanding what you want exactly. If you create records in the production table once they have signed up from the temp table, and you only want people who haven't signed up...you don't need to look in the production table at all. Simply:
SELECT recno, name FROM temp WHERE signup='N'
Or however you're trying to limit your search. If for some reason you do need a union but you're trying to eliminate duplicates you'd have to modify your statement to remove the ALL clause. Union ALL causes you to get duplicates. If you don't want duplicate values, you want to not use ALL in your UNION. You can read up on Unions here.