Table 1 : TOY_STORE
column names :Toy_store_id, Toy_store_name,city
Table 2 : TOY_DTLS
column names :Toy_Id,Toy_name,toy_price,toy_rating
Table 3: Toy_rel
column names : toy_id,toy_store_id,qty
How to display all Toy store names and Toy names?
You can try something like this
SELECT store.Toy_Store_name
, toy.Toy_name
, rel.qty
FROM toy_rel rel
JOIN toy_dtls toy ON rel.toy_id = toy.toy_id
JOIN toy_store store ON rel.toy_store_id = store.toy_store_id
;
Related
first is the main table and second is the lookup table.
I need to compare the column names of first table to the values in the second table and if a certain column name is found in any row of the second table then fetch some fields out of second table.
Is it possible to do it in impala?
Table 1
source |location |origin
----------+----------+-------
s1 |india |xxx
Table 2
extractedfrom|lct |lkp_value|map_value
-------------+----------+---------+---------
s1 |location |india |india_x
s1 |origin |xxx |yyyyyy
i need to have something like
final view required
source |location |origin |location_ll|origin_lkp
----------+----------+----------+-----------+----------
s1 |india |xxx |india_x |yyyyy
You should edit your post to be more specific about what you are trying to do and how you wish to join the tables.
The following query should work for you given the example you provided.
SELECT t1.source,
t1.location,
t1.origin,
t2_loc.map_value AS location_lkp,
t2_ori.map_value AS origin_lkp
FROM Table1 t1
JOIN Table2 t2_loc ON t1.source = t2_loc.extractedfrom
AND t1.location = t2_loc.lkp_value
JOIN Table2 t2_ori ON t1.source = t2_ori.extractedfrom
AND t1.origin = t2_ori.lkp_value
WHERE t2_loc.lct = 'location'
AND t2_ori.lct = 'origin'
The trick is that you join to Table2 multiple times - one for each column you wish to match upon.
I have a pig relation like below:
FINAL= {input_md5::type: chararray,input_md5::name: chararray,input_md5::id: long,input_md5::age: chararray,test_1:: type: chararray,test_2::name:chararray}
I am trying to store all columns for input_md5 relation to a hive table.
like all input_md5::type: chararray,input_md5::name: chararray,input_md5::id: long,input_md5::age: chararray not taking test_1:: type: chararray,test_2::name:chararray
is there any command in pig which filters only columns of input_md5.Something like below:
STORE= FOREACH FINAL GENERATE all input_md5::type .
I know that pig have :
FOREACH FINAL GENERATE all input_md5::type as type syntax, but i have many columns so I cannot use as in my code.
Because when i try:
STORE= FOREACH FINAL GENERATE input_md5::type .. bus_input_md5::name;
Pig throws an error:
org.apache.hive.hcatalog.common.HCatException : 2007 : Invalid column position in partition schema : Expected column <type> at position 1, found column <input_md5::type>
Thanks in advance,
Resolved this issue , below is the fix:
Create a relation with some filter condition as below:
DUMMY_RELATION= FILTER SOURCE_TABLE BY type== ''; (I took a column named type ,this can be filtered by any column in the table , all that matters is we need its schema)
FINAL_DATASET= UNION DUMMY_RELATION,SCHEMA_1,SCHEMA_2;
(this new DUMMY_RELATIONn should be placed 1st in the union)
Now you no more have :: operator And your column names would match hive table's column names, provided your source table (to DUMMY_RELATION) and target table have same column order.
Thanks to myself :)
I implemented Neethu's example this way. May have typos, but it shows how to implement this idea.
tableA = LOAD 'default.tableA' USING org.apache.hive.hcatalog.pig.HCatLoader();
tableB = LOAD 'default.tableB' USING org.apache.hive.hcatalog.pig.HCatLoader();
--load empty table
finalTable = LOAD 'default.finalTable' USING org.apache.hive.hcatalog.pig.HCatLoader();
--example operations that end up with '::' in column names
g = group tableB by (id);
j = JOIN tableA by id LEFT, g by group;
result = foreach j generate tableA::id, tableA::col2, g::tableB;
--union empty finalTable and result
result2 = union finalTable, result;
--bob's your uncle
STORE result2 INTO 'finalTable' USING org.apache.hive.hcatalog.pig.HCatStorer();
Thanks to Neethu!
I have a table pa_master_details and lov_details.
In the pa_master_details table, I have role_comp_emp_final_rating and role_comp_lm_final_rating columns.
In the lov_details table I have a column rating lov_value and lov_text_en.
I need to join role_comp_emp_final_rating with the lov_value column to get lov_text_en
Based on this lov_value, I need to show lov_text_en from the lov_details table.
So I wrote a query like this and am getting the result for emp rating:
SELECT p.employee_number,
p.role_comp_emp_final_rating,
lov_text_en,
p.role_comp_lm_final_rating
FROM pa_master_details P, lov_details L
WHERE p.role_comp_emp_final_rating = l.lov_value
AND p.employee_number = 34570
Similarly, I need to show lov_text_en for role_comp_lm_final_rating from the lov_details table by joining
role_comp_lm_final_rating with lov_value in the same query.
How do I do it?
I think this is what you're asking for:
SELECT p.employee_number,
p.role_comp_emp_final_rating,
lemp.lov_text_en AS "emp_lov_text",
llm.lov_text_en AS "lm_lov_text",
p.role_comp_lm_final_rating
FROM pa_master_details p
JOIN (SELECT lov_text FROM lov_details) lemp ON p.role_comp_emp_final_rating = lemp.lov_value
JOIN (SELECT lov_text FROM lov_details) llm ON p.role_comp_lm_final_rating = llm.lov_value
WHERE p.employee_number = 34570
I have below query in which i need to assign one table column value to another table column.
Query:
SELECT A.aval,B.bval,B.bval1 FROM A JOIN B ON (A.aval = B.bval)
How do I assign one table column value to another table column in Hive?
Have tried
SELECT A.aval,B.bval,B.bval1, A.aval = B.bval1 FROM A JOIN B ON (A.aval = B.bval)
In results:
A.aval = B.bval1, returning false since its not assigning to A.aval.
I guess you want to write in a table ?
So You have to create a table (for example C) which contains all the fields you need.
And then you do :
INSERT [OVERWRITE] INTO TABLE C
SELECT A.aval,B.bval,B.bval1, A.aval
FROM A
JOIN B ON (A.aval = B.bval)
The result of the select will be inserted in the table C
insert overwrite table c SELECT A.aval,B.bval,B.bval1 FROM A JOIN B ON (A.aval = B.bval)
am a newbie to Oracle/PL SQL.I've 2 tables A and B.
A has a column CustId,Age,Location and Date. Table B has 2 columns CustId,CustName.
What would be the sql query to show show CustName and Location for a given age?
Thanks.
your question "What would be the sql query to show show CustName and Location for a given age?" helps define your query pretty well:
SELECT CustName, Location
FROM TableA a
INNER JOIN TableB b
ON b.CustId = a.CustId
WHERE a.Age = #
All we need to do on top of that select for your specific fields is make sure to join the two tables on their common column (CustID).
Another option would be to avoid the WHERE statement:
SELECT CustName, Location
FROM TableB b
INNER JOIN TableA a
ON a.CustID = b.CustID
AND a.Age = #
you need join. something like
SELECT custname, location FROM a JOIN b ON a.custid = b.custid WHERE age = [age];