How do I find matches to update in SQL when inner join or join says there are no matches?

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I am working with the SSDI released in 2013 and another death record. However, when trying to see how many records match by SSN I am getting zero results returned. Here is the code that I am using:

select allcalSSNs.Last_name,allcalSSNs.First_name,allcalSSNs.ssn from ssdm JOIN allcalSSNs ON allcalSSNs.SSN = ssdm.ssn

I have even tried a sub select when also returned zero results.

I have never ran into this issue before with any table I have tried this on.

there are approximately 9,000,000 records in the allcalSSNs and there are about 91,000,000 in the SSDI.

I could really use some guidance on this since I know there are some examples that should be in both.

What I have tried:

Already stated in above sentence: both sub select and inner join/join method.

Posted 15-Mar-20 15:13pm

Member 11856456

Updated 15-Mar-20 21:14pm

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OriginalGriff · Accepted Answer · 2020-03-15T21:15:00

If I set up trivial data tables to match your query:

SQL

CREATE TABLE [dbo].[allcalSSNs](
	[ssn] [int] NOT NULL,
	[Last_name] [nchar](10) NOT NULL,
	[First_Name] [nchar](10) NOT NULL
) ON [PRIMARY]
CREATE TABLE [dbo].[ssdm](
	[ssn] [int] NOT NULL
) ON [PRIMARY]

INSERT [dbo].[allcalSSNs] ([ssn], [Last_name], [First_Name]) VALUES (2, N'2222      ', N'222222    ')
INSERT [dbo].[allcalSSNs] ([ssn], [Last_name], [First_Name]) VALUES (4, N'4444      ', N'444444    ')
INSERT [dbo].[ssdm] ([ssn]) VALUES (1)
INSERT [dbo].[ssdm] ([ssn]) VALUES (2)
INSERT [dbo].[ssdm] ([ssn]) VALUES (3)

And I run your query:

SQL

select allcalSSNs.Last_name,allcalSSNs.First_name,allcalSSNs.ssn from ssdm JOIN allcalSSNs ON allcalSSNs.SSN = ssdm.ssn

I get What I expect: one row of data:

Last_name   First_name  ssn
2222        222222      2

So if your query isnl;t returning dtaa when run against your live DB then one of three things is happening:
1) That's not the query you are running.
2) You are running it against the wrong DB
3) The data in your DB is not what you expected.

We can't help you with that: we have no access to your DB at all.