I am trying to join two tables from a database; energyImport and sunAlt.
energyImport has three columns: timestamp_id, energy, duration.
sunAlt has two columns: timestamp_id, altitude
I am doing an inner join on these two tables using the SQL:
SELECT *
FROM energyImport
INNER JOIN sunAz ON sunAz.timestamp_id = energyImport.timestamp_id;
The output from this is:
timestamp_id,duration,energy,timestamp_id,altitude
1601769600,1800,81310,1601769600,0.0
1601771400,1800,78915,1601771400,0.0
1601773200,1800,78305,1601773200,0.0
The problem is that the timestamp_id column is repeated. How can I join these columns and only include the first timestamp_id?
Replace the * with
energyImport.timestamp_id,energyImport.duration, energyImport.energy,
sunAz.altitude
Either you specify the columns that you want in the results:
SELECT e.timestamp_id, e.duration, e.energy, s.altitude
FROM energyImport e INNER JOIN sunAz s
ON s.timestamp_id = e.timestamp_id;
Or, use NATURAL instead of INNER join, so that the join is based on the columns(s) with the same names of the 2 tables (if this fits your requirement), because NATURAL join returns only 1 of each pair of these columns:
SELECT *
FROM energyImport NATURAL JOIN sunAz;
See the demo.
Related
I have some tables that can be accessed here and I would like to get a new table with EntryId from Entry table and ProtocolNumber from JudicialOrder table. For that I'm using this query:
SELECT DISTINCT ET.EntryId, JOA.ProtocolNumber FROM Entry AS ET
LEFT JOIN JudicialOrderAccount AS JOT ON JOT.AccountId = ET.OwnerAccountId
INNER JOIN JudicialOrder AS JOA ON JOA.JudicialOrderId = JOT.JudicialOrderId;
But the ProtocolNumber is duplicated, what could be wrong with my query?
As Kurt said only the combination of ET.EntryId, JOA.ProtocolNumber is unique. You will recognize it if you add an order by.
SELECT DISTINCT ET.EntryId, JOA.ProtocolNumber FROM Entry AS ET
LEFT JOIN JudicialOrderAccount AS JOT ON JOT.AccountId = ET.OwnerAccountId
INNER JOIN JudicialOrder AS JOA ON JOA.JudicialOrderId = JOT.JudicialOrderId
ORDER BY ET.EntryId, JOA.ProtocolNumber;
If you would really like to have unique protocol number you would need to group by ProtocolNumber and wrap EntryId in some string_agg function (depends on your database).
FYI: Your LEFT JOIN - INNER JOIN combination ends up being two INNER JOINs, see
as the title states, Let's say i have three tables: person, autos, numbers.
Created
First table with: INNER JOIN of person and autos
Second Table with: INNER JOIN of autos and numbers
Question: Is it possible to INNER JOIN first and second table ?
You can join the two tables based on the autos part. Assuming it has an ID:
SELECT *
FROM first_table f
JOIN second_table s ON f.auto_id = s.auto_id
You can do 2 joins (with 3 tables) together. Which are the keys for the joins? personID for person and autos and on numbers
SELECT *
FROM person p
JOIN autos a ON p.keyA= a.keyA
JOIN numbers n ON a.keyB = n.keyB
Where keyA and keyB are the corresponding field on which you want to do the join.
I am attempting to access data from the following tables:
OrgPlanYear
ProjOrgPlnYrJunction
DC
DCMaxEEContribLevel
DCNonDiscretionaryContribLevel
Basically, I need to inner join OrgPlanYear + DC and ProjOrgPlnYrJunction then I need to Left Join the remaining tables (tables 4 and 5) due to the fact the tables 1-3 have all the rows I need and only some have data in tables 4-5. I need several variables from each table. I also need the WHERE function to be across all fields (meaning I want all this data for a select group where projectID=919).
Please help!
I have tried many things with errors including attempting to use the Design Query side (i.e. JOIN function issues, badly formatted FROM function, etc.)! Here is an example of one excluding all variables I need:
SELECT
ProjOrgPlnYrJunction.fkeyProjectID, OrgPlanYear.OrgName, DC.PlanCode, DCNonDiscretionaryContribLevel.Age,DCNonDiscretionaryContribLevel.Service
FROM
(((OrgPlanYear INNER JOIN DC ON OrgPlanYear.OrgPlanYearID = DC.fkeyOrgPlanYearID) INNER JOIN ProjOrgPlnYrJunction ON OrgPlanYear.OrgPlanYearID = ProjOrgPlnYrJunction.fkeyOrgPlanYearID)
LEFT JOIN
(SELECT DCNonDiscretionaryContribLevel.Age AS Age, DCNonDiscretionaryContribLevel.Service AS Service FROM DCNonDiscretionaryContribLevel WHERE ProjOrgPlnYrJunction.fkeyProjectID)=919)
LEFT JOIN (
SELECT DCMaxEEContribLevel.EEContribRoth FROM EEContribRoth WHERE ProjOrgPlnYrJunction.fkeyProjectID)=919)
ORDER BY OrgPlanYear.OrgName;
Main issues with your query:
Missing ON clauses for each LEFT JOIN.
Referencing other table columns in SELECT and WHERE of a different subquery (e.g., FROM DCNonDiscretionaryContribLevel WHERE ProjOrgPlnYrJunction.fkeyProjectID).
Unmatched parentheses around subqueries and joins per Access SQL requirements.
See below adjusted SQL that now uses short table aliases. Be sure to adjust SELECT and ON clauses with appropriate columns.
SELECT p.fkeyProjectID, o.OrgName, DC.PlanCode, dcn.Age, dcn.Service, e.EEContribRoth
FROM (((OrgPlanYear o
INNER JOIN DC
ON o.OrgPlanYearID = DC.fkeyOrgPlanYearID)
INNER JOIN ProjOrgPlnYrJunction p
ON o.OrgPlanYearID = p.fkeyOrgPlanYearID)
LEFT JOIN
(SELECT Age AS Age, Service AS Service
FROM DCNonDiscretionaryContribLevel
WHERE fkeyProjectID = 919) AS dcn
ON dcn.fkeyProjectID = p.fkeyOrgPlanYearID)
LEFT JOIN
(SELECT EEContribRoth
FROM EEContribRoth
WHERE fkeyProjectID = 919) AS e
ON e.fkeyProjectID = p.fkeyProjectID
ORDER BY o.OrgName;
i have three table to join in select query .. this query not working
select policy_master.POLICY_REFER ,policy_master.CLIENT_NAME ,policy_master.ADRESS ,policy_master.POLICY_CLASS ,policy_master.POLICY_PRODUCT ,policy_master.EXECUTIVE_NAME ,policy_master.COMM_DATE ,
policy_master.EXPIRY_DATE ,policy_master.RENEWAL_DATE ,policy_master.GROSS ,policy_master.FED ,policy_master.FIF ,policy_master.STAMP_DUTY ,policy_master.PERMIUM ,policy_master.DESCRIPTION,
POLICY_INSURER_DETAIL.INSURER_NAME,POLICY_INSURER_DETAIL.POLICY_NUMBER,POLICY_INSURER_DETAIL.P_SHARE,POLICY_INSURER_DETAIL.G_PREMIUM,POLICY_INSURER_DETAIL.BROKER_P,POLICY_INSURER_DETAIL.LEVY,
POLICY_INSURER_DETAIL.LEVY,POLICY_SUBAGENT_DETAIL.SUBAGENT_NAME,POLICY_SUBAGENT_DETAIL.BUSSINES_SHARE,POLICY_SUBAGENT_DETAIL.COMM_P,POLICY_SUBAGENT_DETAIL.COMM_VALUE
from POLICY_MASTER INNER JOIN POLICY_INSURER_DETAIL
on policy_master.policy_refer = POLICY_INSURER_DETAIL.POLICY_REFER and
policy_master.policy_refer = POLICY_SUBAGENT_DETAIL.POLICY_REFER;
Please tell me what i should do
To simplify the answer I've removed all explicit columns and replaced them with select *.
You have only joined two tables. You are refering to policy_subagent_detail table inside a join to policy_insurer_detail (but you're not joining the subagent details table). You should join this table and specify joining conditions in order to be able to retrieve columns from it (as you did in your column list near select keyword).
I've also added table aliases to make your code shorter.
select *
from POLICY_MASTER pm
inner join POLICY_INSURER_DETAIL pid on
pm.policy_refer = pid.POLICY_REFER
inner join POLICY_SUBAGENT_DETAIL psd on -- added join
pm.policy_refer = psd.POLICY_REFER
do inner join of the third table required you missed iton the from clause . thats it .OR you can use where clause like
from table1 a,table2 b,table3 c
where a.colname= b.colname and
b.colname=c.colname.
I have two columns i need to show all the records in column [PR] and some columns from column [EM]. The below SQL statement does not return all the records from column [PR].
SELECT
[PR].[WBS1], [EM].[FirstName], [EM].[LastName], [EM].[EMail]
FROM
[VisionDemo].[dbo].[PR]
JOIN
[VisionDemo].[dbo].[EM] ON [VisionDemo].[dbo].[PR].[Principal] = [VisionDemo].[dbo].[EM].[Employee]
How do I do this ?
Use a LEFT JOIN:
SELECT [PR].[WBS1],[EM].[FirstName],[EM].[LastName], [EM].[EMail]
FROM [VisionDemo].[dbo].[PR]
LEFT JOIN [VisionDemo].[dbo].[EM]
ON [VisionDemo].[dbo].[PR].[Principal] = [VisionDemo].[dbo].[EM].[Employee]
Use LEFT JOIN. This is fundamental stuff, go check out the FAQ
SELECT [PR].[WBS1],[EM].[FirstName],[EM].[LastName], [EM].[EMail]
FROM [VisionDemo].[dbo].[PR]
LEFT JOIN [VisionDemo].[dbo].[EM] --Use a left join
ON [VisionDemo].[dbo].[PR].[Principal] = [VisionDemo].[dbo].[EM].[Employee]