Hi I have a table DataTable as :
Name Age Address
----------------
Tom 21 XYZ
John 23 X123
Sam 32 Y123
there is another table MappingTable :
Name Address
-------------
John A12345
Now I want to create a query that returns the following :
Name Age Address
----------------
Tom 21 XYZ
John 23 A12345
Sam 32 Y123
How can I do this. I tried joining the tables but that would replace the complete column. I cannot even use Update since I am only returning a view using this query.
Thanks,
Monica
select dt.name,
dt.age,
coalesce(mt.address, dt.address)
from DataTable dt
left join MappingTable mt
on mt.Name = dt.Name;
Related
I have a need to concatenate name information from two tables in a specific order. So far, all I have is the SQL to retrieve the data. I need help with the SQL to output a name string in the correct order.
example data:
TBL_TITLE_ORDER
ORDER_ID
ORDER_SEQUENCE
TITLE_ID
FIRSTNAME_ID
20
1
30
20
2
456
20
3
33
21
1
31
21
2
32
TBL_TITLE
TITLE_ID
TITLE_NAME
30
Mr
31
Mrs
32
Jones
33
Smith
TBL_FIRSTNAME
FIRSTNAME_ID
NAME
456
John
SELECT TBL_TITLE.TITLE_NAME, TBL_FIRSTNAME.NAME
FROM (TBL_TITLE_ORDER LEFT JOIN TBL_TITLE ON TBL_TITLE_ORDER.TITLE_ID = TBL_TITLE.TITLE_ID) LEFT JOIN TBL_FIRSTNAME ON TBL_TITLE_ORDER.FIRSTNAME_ID = TBL_FIRSTNAME.FIRSTNAME_ID
WHERE (TBL_TITLE_ORDER.ORDER_ID) = 20
ORDER BY TBL_TITLE_ORDER.ORDER_SEQUENCE;
The output I need is a complete name string in the proper order sequence. There may or may not be a record in the TBL_FIRSTNAME table.
What I have so far:
TITLE_NAME
NAME
Mr
John
Smith
Required output:
Mr John Smith
Mrs Jones
Let's say I've got the following database table
Name | Nickname | ID
----------------------
Joe Joey 14
Joe null 14
Now I want to do a select statement that merges these two columns to one while replacing the null values. The result should look like this:
Joe, Joey, 14
Which sql statement manages this (if it's even possible)?
Simplest solution:
SQL> select * from t69
2 /
NAME NICKNAME ID
---------- ---------- ----------
Joe Joey 14
Joe 14
Michael 15
Mick 15
Mickey 15
SQL> select max(name) as name
2 , max(nickname) as nickname
3 , id
4 from t69
5 group by id
6 /
NAME NICKNAME ID
---------- ---------- ----------
Joe Joey 14
Michael Mickey 15
SQL>
If you have 11gR2 you could use the new-fangled LISTAGG() function but otherwise it is simple enough to wrap the above statement in a SELECT which concatenates the NAME and NICKNAME columns.
AFAIK,
the question is not clear.so i am making some assumptions over here.
your output has the first and 3rd columns for both the rows as same.
Only the 2nd field is different.
so u can simply write a select quest
select one.name,two.nick_name,one.id from
(select name,id from your_tb group by name,id) one,
your_tb two
where two.nickname is not NULL
and two.name=one.name
and two.id=one.id;
may be we can tune this but i am not good in tuning sql squeries,but this is the way i suppose u need.
I have a table in the following format
ID Property Value
1 name Tim
1 location USA
1 age 30
2 name Jack
2 location UK
2 age 27
And I would like an output in the following format
ID name location age
1 Tim USA 30
2 Jack UK 27
In python I can do
table_agg = table.groupby('ID')[['Property','Value']].apply(lambda x: dict(x.values))
p = pd.DataFrame(list(table_agg))
How to write the query in Hive?
You can use collect_list,map functions to group the data then access the array based on key.
Example:
hive> create table t1(id int,property string,valu string) stored as orc;
hive> insert into t1 values(1,"name","Tim"),(1,"location","USA"),(1,"age","30"),(2,"name","Jack"),(2,"location","UK"),(2,"age","27");
hive> select id,
va[0]["name"]name,
va[1]["location"]location,
va[2]["age"]age
from (
select id,collect_list(map(property,value))va
from <table_name> group by id
)t;
Result:
id name location age
1 Tim USA 30
2 Jack UK 27
I have two tables and I need to find the person with the highest value.
TABLE1
NAME ID
--------------- ---------------
MIKE 101
MIKE 102
BETTY 103
BETTY 104
BETTY 105
TIM 106
TABLE2
ID VALUE
-------- --------------
101 12
102 10
103 20
104 20
105 10
106 5
I can write a select statement that will give a result of name and values:
SELECT name, value
FROM table1, table2
WHERE table1.id = table.id;
NAME VALUE
----- ----------
MIKE 12
MIKE 10
BETTY 20
BETTY 20
BETTY 10
TIM 5
Now I need to aggregate the values of the rows with equal names and I can not figure it out. Am I going about it the correct way?
Please try this :
select a.name,max(b.value) as value
from table1 a
inner join table2 b on a.id = b.id
group by a.name
Anyway, you tagged mysql and oracle in the question. Luckily, this sql works in both. But you have to remove one of these two tags, to make sure which dbms are you use.
Use this.. and since your column names are unique, you don't need any alias.
select name, max(value) as MaxValue
from table1
inner join table2 on table1.id = table2.id
group by name
Let's say I've got the following database table
Name | Nickname | ID
----------------------
Joe Joey 14
Joe null 14
Now I want to do a select statement that merges these two columns to one while replacing the null values. The result should look like this:
Joe, Joey, 14
Which sql statement manages this (if it's even possible)?
Simplest solution:
SQL> select * from t69
2 /
NAME NICKNAME ID
---------- ---------- ----------
Joe Joey 14
Joe 14
Michael 15
Mick 15
Mickey 15
SQL> select max(name) as name
2 , max(nickname) as nickname
3 , id
4 from t69
5 group by id
6 /
NAME NICKNAME ID
---------- ---------- ----------
Joe Joey 14
Michael Mickey 15
SQL>
If you have 11gR2 you could use the new-fangled LISTAGG() function but otherwise it is simple enough to wrap the above statement in a SELECT which concatenates the NAME and NICKNAME columns.
AFAIK,
the question is not clear.so i am making some assumptions over here.
your output has the first and 3rd columns for both the rows as same.
Only the 2nd field is different.
so u can simply write a select quest
select one.name,two.nick_name,one.id from
(select name,id from your_tb group by name,id) one,
your_tb two
where two.nickname is not NULL
and two.name=one.name
and two.id=one.id;
may be we can tune this but i am not good in tuning sql squeries,but this is the way i suppose u need.