I have two tables, one has hundreds of variables and I'm only interested in a few dozen.
The other is a single column whose values are the exact names of the variables I'm interested in from the first table.
I need to extract variables from the first table, and I'm trying to avoid using the keep statement in base SAS. I'm thinking something like this:
CREATE TABLE table3 as
SELECT (SELECT var FROM table2)
FROM table3
Thanks in advance.
Related
I have two tables say TABLE1 and TABLE2. And say the field id is common in both. Rest of field are different.
I now select all distinct id from TABLE1 and want to insert them into TABLE2 while also writing its other attributes. Like the pseudocode below.
for each distinct id (i) in TABLE1:
INSERT in TABLE2 (i, false, unix_timestamp())
end
Now I for some reason cannot use a programming language to do this. Is it possible to do this in SQL using Apache Drill?
What you could do is write a query that produces the output you're looking for and then save that as a table. Drill is really a query engine and doesn't support INSERT operations the way a database does.
So a pseudo query migth look like this:
CREATE TABLE <your file> AS
SELECT ...
Then you could query that file. I don't know if that helps or not. You can also create views and temporary tables, but Drill itself doesn't really implement INSERT commands.
I know that SQL joins exist but that is only for one column against another column in another table. Is there any way to do something similar with one column against a whole table? I'm trying to figure out if the people that exist within one organization are a certain kind of employee. The problem is I have all the people in a organization listed within a column in one table while the classification for people is scattered throughout various columns in another table.
While I will answer this, I recommend you do one of those schoolkids tutorials on SQL. This question is at such a basic level you'll probably just get confused by the answers anyway...
From your question I would gather that the tables are probably modeled incorrectly to start with (not normalized well enough). But if you want to join a column to all the columns in another table you can do it in two ways:
SELECT COLUMN_1 FROM TABLE_1 T1 INNER JOIN TABLE_2 T2 ON T1.COLUMN_1 = T2.COLUMN_1
UNION ALL
SELECT COLUMN_1 FROM TABLE_1 T1 INNER JOIN TABLE_2 T2 ON T1.COLUMN_1 = T2.COLUMN_2
UNION ALL
... (just change the column name on each row)
(works best if you copy/paste this into Excel with a macro and a list of column names from table 2).
2) More complex: create a view or subquery where you first union all columns in table 2 one by one (hopefully they all have the same type!) and then join to the subquery, which now acts as a table with just one column.
3) Start pivoting table 2. Not going into that one, too complex for your current level.
Yes, you can Basically if you have one Table and then you want to filter out some name from there and then you can use joins
and the second part is yes you can add multiple conditions with the help of where clause.
and id you want to join on multiple conditions then also you can do with and condition
So I need to figure out how to insert into a table, from another table, with a where clause that requires me to access the table that I am inserting into. I tried an alias from the table I am inserting into, but I quickly found out that you cannot do that. Basically, what I want to check is that the values that I am inserting into the table match a particular field within the table that I am inserting into. Here is what I've tried:
INSERT INTO "USER"."TABLE1" AS A1
SELECT *
FROM "USER"."TABLE2" AS A2
WHERE A2."HIERARCHYLEVEL" = 2
AND A2."PARENT" = A1."INSTANCE"
Obviously, this was to no avail. I've tried a couple other queries, but they didn't me anywhere, either. Any help would be much appreciated.
EDIT:
I would like to add rows to this table, not add columns to the table. The two tables are of the exact same structure -- in fact, I extracted the data already in table1 from table2. What I have in table1 currently is a bunch of records who have NO PARENT, but an instance. What I want to add is all the records who have a parent in table2 that are equal to the instance in table 1.
Currently there is no way to join on a table when inserting. The solution with the subselect where you select from the table, is the correct.
Aliasing the table you want to change is only possible with UPDATE, UPSERT and MERGE. For these operations it makes sense, as you need to match a column and then decide if you need to update it or insert something instead. In your example the line from table1 that you match is not relevant, as you don't want to change it, so from the statement point of view it is not really relevant that the table you use in your subselect is the same that the one you insert into.
As alternative, I can suggest you following solution, which is equivalent with yours:
INSERT INTO "user"."table1"
SELECT
A1."ROOT",
A1."INSTANCE",
A1."PARENT",
A1."HIERARCHYLEVEL"
FROM "user"."table2" AS A1
WHERE A1."INSTANCE" in (select "PARENT" from "user"."table1")
AND A2."HIERARCHYLEVEL" = 2
This gave me the answer I was looking for, although I am sure there is an easier -- or more efficient -- way to do it.
INSERT INTO "user"."table1"
SELECT
A1."ROOT",
A1."INSTANCE",
A1."PARENT",
A1."HIERARCHYLEVEL"
FROM "user"."table2" AS A1,
"user"."table1" AS A2
WHERE A1."INSTANCE" = A2."PARENT"
AND A2."HIERARCHYLEVEL" = 2
I have a situation where I want to combine two tables for queries in a select statement, and I haven't found a working solution yet.
The Situation:
Table A
Table B
Both A and B have identical fields but distinct populations. I have other queries that are pulling from each table separately.
I want to build a query that pulls from them as if they were one table. There are no instances of records being in both tables.
My research so far led me to think the FULL OUTER JOIN was what I wanted, but I'm not entirely sure how to do that when I'm not really joining them on any field and it failed in my tests. So I searched for append options thinking that might more accurately represent what I'm trying to do and the INSERT INTO looked promising but less so for select statements. Is there a way to do this or do I need to create a third table that's the combination of the first two to query from?
.
This is being done as an Excel VBA query to Access via DAO. I'm building up SQL statements piece by piece in my VBA code based on user-selected options and then pulling the results into Excel for use. AS such my hope is to be able to only alter the FROM statement (since I'm building up the queries piecemeal) to effect this so that any other aspects of the select statement won't be impacted. Any suggestions or help will be much appreciated!
You can UNION the tables to do this:
SELECT StuffYouWant
FROM (SELECT *
FROM TableA
UNION ALL
SELECT *
FROM TableB) c
Something like this:
SELECT * FROM a
UNION
SELECT * FROM b
Make sure the a table and the b table have the same number of columns and the corresponding columns have the same data type
I have a table of numbers (PLSQL collection containing some_table_line_ids passed in from a website).
Then I have some_table also has columns -> config_data, config_state
I want to pull in all lines that have the same table_id from the all the table_ids in the number table.
I also want to pull in all lines that have the same config_data as each record pulled in from the first part.
So its a parent/child relationship. This can be done in two for loops by selecting a line by an id in a cursor then another for loop selecting each line equaling the parents config data. Each loop I am performing data manipulation on each line.
I would like to combine both these into a single cursor having all table ids that I need.
What would that look like?
You just want to do a complicated join on different factors. Something like:
select st2.*
from numbers n join
some_table st
on st.table_id = n.table_id join
some_table st2
on st2.config_data = st.config_data
Quite possibly, you actually want:
select distinct st.*
since you might otherwise have duplicates. Or, you might want:
select n.table_id, st.config_data, st2.*
So you know which of the original values was responsible for bringing in the row.
You describe the array as a PL/SQL collection. If you employ a SQL type instead you could include it in the FROM clause by using the TABLE function.
create type some_table_line_id_nt as table of number;
Something like:
select s.*
from some_table s
join table(some_table_line_ids) t
on s.id = t.column_value
(I haven't offered a complete solution as you haven't given enough details of table structure and data.)
I solved the issue using start with and connect by prior.