I have 2 tables with 2 columns (user_id and year).
Query1:
SELECT * FROM table_1 t1
FULL JOIN table_2 t2 ON t1.user_id=t2.user_id AND t1.year=t2.year
Produces following column names:
user_id, year, user_id_1, year_1
Query2:
CREATE TABLE table_copy AS SELECT * FROM
(SELECT * FROM table_1 t1
FULL JOIN table_2 t2 ON t1.user_id=t2.user_id AND t1.year=t2.year);
Produces following vague column names:
QCSJ_C000000000400000, QCSJ_C000000000400002, QCSJ_C000000000400001, QCSJ_C000000000400003
Is there a short way to force Oracle query2 to use the same names as query1 without writing them explicitly (it is important when there are many columns)? Maybe some Oracle settings?
List your columns and use AS to specify the column name.
e.g.
CREATE TABLE table_copy AS
SELECT t1.user_id AS t1_user_id,
t1.year AS t1_year,
t2.user_id AS t2_user_id,
t2.year AS t2_year
FROM table_1 t1
FULL JOIN table_2 t2 ON t1.user_id=t2.user_id
AND t1.year=t2.year;
I didn't fully understand your expected part but what I understood is you want all columns from table_1 or from table_2 only
if it is like this only you can use following query to create table ..
CREATE TABLE table_copy AS SELECT * FROM
(SELECT t1.* FROM table_1 t1 FULL JOIN table_2 t2
ON t1.user_id=t2.user_id
AND t1.year=t2.year);
or if you want both table's column but with different name in sql then you have to follow query suggested by cagcowboy only....
but you can create table with prefix like "t1_" in plsql without specify or write all column name..
Related
I have a query that I'm trying to rework that has over 1,000 columns when I select * FROM several tables. I want to know if there is a way in SQL to tag the column alias with the table alias so i can know from which table the columns are from. It looks like the following:
SELECT *
FROM table1 t1
join table2 t2
join table3 t3
join table4 t4
Current column output:
id, id, id, id, name, name, name, name, order, order, order, order
Desired Column output:
t1.id, t1.name, t1.order, t2.id, t2.name, t2.order,t3.id, t3.name, t3.order, t4.id, t4.name, t4.order
this is a very simple example but you can imagine trying to fish out the column you need of a sea of 1,000 columns trying to figure out what table it came from! Any ideas??
I'm not aware of a way to prefix each column with the column alias. However I do know how you could easily break the columns into groups that would allow you to figure out which table each column comes from.
SELECT 'T1' as [Table1]
, t1.*
, 'T2' as [Table2]
, t2.*
, 'T3' as [Table3]
, t3.*
, t4.* as [Table4]
, t4.*
, 'T5' as [Table5]
, t5.*
FROM table1 t1
join table2 t2
join table3 t3
join table4 t4
This would break out the columns into groups by table and it would break a little bookmark before and after each group to help you understand where they're coming.
I know not exactly what you asked for but I believe it would help you a lot in figuring out what's from what tables.
Your other option is as others have said and specifiying the prefix on every column which it sounds like you don't want to do. However it can be a lot quicker to do this if you drag the columns from the Object Explorer - and use ALT-SHIFT to add the prefix to each column.
Here's an article about copying columns from object explorer - https://www.qumio.com/Blog/Lists/Posts/Post.aspx?ID=56
Her's an article about adjusting code using ALT+SHIFT - https://blogs.msdn.microsoft.com/sql_pfe_blog/2017/04/11/quick-tip-shiftalt-for-multiple-line-edits/
The first method would take less than a method, the 2nd method I could see taking less than 10 minutes even for 1,000 columns.
You have to assign non-default column aliases manually:
select t1.id as t1_id, t1.name as t1_name, t1.order as t1_order,
t2.id as t2_id, t2.name as t2_name, t2.order as t2_order,
. . .
You might find that a spreadsheet or query can help, if you have a lot of columns.
Some products may have exceptions, but generally no, you can't do that. You either have to use wildcards (SELECT *) or specify the columns you wish returned by full and complete name.
If you specify columns, you can "alias" them, set the column name to something other than the source name. For example (psuedo-code, leaving out the "ON" clause):
SELECT
T1.Id as T1_Id
,T2.Id as T2_Id
from table1 T1
join table2 T2
Note that you can combine table aliases with wildcards. For example:
SELECT
T2.*
from table1 T1
join table2 T2
join table3 T3
join table4 T5
will return all the columns from table2, and only from table2. This might help in revising your query by getting a list of the available columns in each table.
I am attempting a very basic difference function in postgresql. Table 1 and Table 2 have identical columns. Only difference is Table 1 has some surplus rows. I would like to select for surplus rows only:
SELECT *
FROM table1
WHERE NOT EXISTS (SELECT * from table2);
The query above returns nothing when I know there are surplus rows.
I think you are looking for except:
select t1.*
from table1 t1
except
select t2.*
from table2 t2;
Note that the two tables must have the same number of columns, and the columns must all be of the same type. You can review the documentation here.
If you wish to use NOT EXISTS you're missing the joining of your table's keys in the inner where clause. Try:
SELECT *
FROM table1 t1
WHERE NOT EXISTS (SELECT * from table2 t2 WHERE t2.id = t1.id);
I am trying to write an SQL query that will return Table1, which has 10 columns. This table consists of a primary key id, 4 foreign key Id columns, and 5 other columns that I want to return but not change. The goal is to do a join to replace the foreign key Ids with their descriptions that are held in other tables.
Here is one attempt with the first FK Id:
Select * from Table1 t1
left join Table2 t2
on t1.BranchId = t2.BranchId;
This left join returns the description from table2, but does not replace it.
Here is another with the first FK Id:
Select t2.BranchName from Table1 t1
left join Table2 t2
on t1.BranchId = t2.BranchId;
This returns the name I want, but does not return table1 fully.
For the sake of an example you could pretend that OtherName3, OtherName4, OtherName5 are in tables Table3, Table4, Table5, respectively.
This may seem trivial for experienced SQL devs, but I am having a hard time figuring out the syntax.
Thanks!
I'm not sure what you mean by replace it.
I think you just need to list out all the columns you want:
Select t1.col1, t1.col2, t1.col3, . . .,
t2.name
from Table1 t1 left join
Table2 t2
on t1.BranchId = t2.BranchId;
I don't know what you mean by 'replace' but you just need to qualify what columns from which table you want. That goes for all tables you are joined to, especially if they have the same column name in multiple tables. I put junk columns in since I don't know your tables but you should get the general idea.
Select t2.BranchName, t1.BranchId, t1.Name, t1.Amount, t2.BranchLocation from Table1 t1
left join Table2 t2
on t1.BranchId = t2.BranchId;
I think this is what you are looking for:
select t1.*, t2.BranchName from Table1 t1
left join Table2 t2
on t1.BranchId = t2.BranchId;
Return Table1 fully (all columns) and only the description (BranchName) from Table2.
If using SQL Server, see all syntax options for the SELECT clause here:
https://msdn.microsoft.com/en-us/library/ms176104.aspx
I want an SQL code which should perform the task of data scrubbing.
I have two tables both contain some names I want to compare them and list out only those name which are in table 2 but not in table 1.
Example:
Table 1 = A ,B,C
Table 2 = C,D,E
The result must have D and E?
SELECT t2.name
FROM 2 t2
LEFT JOIN
1 t1 ON t1.name=t2.name
WHERE t1.name IS NULL
select T2.Name
from Table2 as T2
where not exists (select * from Table1 as T1 where T1.Name = T2.Name)
See this article about performance of different implementations of anti-join (for SQL Server).
select t2.name
from t2,t1
where t2.name<>t1.name -- ( or t2.name!=t1.name)
If the DBMS supports it:
select name from table2
minus
select name from table1
A more portable solution could also be:
select name from table2
where name not in (select name from table1)
I am a little confused as to how to approach this SQL query.
I have two tables (equal number of records), and I would like to return a column with which is the division between the two.
In other words, here is my not-working-correctly query:
SELECT( (SELECT v FROM Table1) / (SELECT DotProduct FROM Table2) );
How would I do this? All I want it a column where each row equals the same row in Table1 divided by the same row in Table2. The resulting table should have the same number of rows, but I am getting something with a lot more rows than the original two tables.
I am at a complete loss. Any advice?
It sounds like you have some kind of key between the two tables. You need an Inner Join:
select t1.v / t2.DotProduct
from Table1 as t1
inner join Table2 as t2
on t1.ForeignKey = t2.PrimaryKey
Should work. Just make sure you watch out for division by zero errors.
You didn't specify the full table structure so I will assume a common ID column to link rows in the tables.
SELECT table1.v/table2.DotProduct
FROM Table1 INNER JOIN Table2
ON (Table1.ID=Table2.ID)
You need to do a JOIN on the tables and divide the columns you want.
SELECT (Table1.v / Table2.DotProduct) FROM Table1 JOIN Table2 ON something
You need to substitue something to tell SQL how to match up the rows:
Something like: Table1.id = Table2.id
In case your fileds are both integers you need to do this to avoid integer math:
select t1.v / (t2.DotProduct*1.00)
from Table1 as t1
inner join Table2 as t2
on t1.ForeignKey = t2.PrimaryKey
If you have multiple values in table2 relating to values in table1 you need to specify which to use -here I chose the largest one.
select t1.v / (max(t2.DotProduct)*1.00)
from Table1 as t1
inner join Table2 as t2
on t1.ForeignKey = t2.PrimaryKey
Group By t1.v