How can I get sql update from another table?
I have 2 tables in my database.
Table #1
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| name | family | phone | email | gender | phone2 | address | birthdate |
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Table #2
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| gender | address | phone | birthdate |
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in table #1 columns address and phone2 is empty and columns gender and birthdate values is same as table #2.
How can I read data from table #2 and update address and phone2 in table #1 with values from table #2 address and phone columns when gender and birthdate are the same in each row?
for example: this is some data in Table #1
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| name | family | phone | email | gender | phone2 | address | birthdate |
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| john | doe | 12345| t@t.com| Male | | | 1980-01-01|
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| mike | clark | 65432| x@y.com| Male | | | 1990-01-01|
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| Sara | King | 875465| a@b.com|Female| | | 1970-01-01|
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and here is some data in table #2
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| gender | address | phone | birthdate |
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| Male | 1704test|0457852|1980-01-01 |
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| Female | 1705abcs|0986532|1970-01-01 |
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| Male | 1602cyzd|0326589|1990-01-01 |
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I want to update table #1 with data from table #2 and check gender and birthdate and make table #1 like
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| name | family | phone | email | gender | phone2 | address | birthdate |
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| john | doe | 12345| t@t.com| Male |0457852 |1704test | 1980-01-01|
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| mike | clark | 65432| x@y.com| Male |0326589 |1602cyzd| 1990-01-01|
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| Sara | King | 875465| a@b.com|Female |0986532 |1705abcs| 1970-01-01|
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How can I do this?
To get sql update from another table- There are quite a few ways to achieve your desired results.
Non Deterministic methods
(in the event that many rows in table 2 match one in table 1)
UPDATE T1
SET address = T2.address,
phone2 = T2.phone
FROM #Table1 T1
JOIN #Table2 T2
ON T1.gender = T2.gender
AND T1.birthdate = T2.birthdate
Or a slightly more concise form
UPDATE #Table1
SET address = #Table2.address,
phone2 = #Table2.phone
FROM #Table2
WHERE #Table2.gender = #Table1.gender
AND #Table2.birthdate = #Table1.birthdate
Or with a CTE
WITH CTE
AS (SELECT T1.address AS tgt_address,
T1.phone2 AS tgt_phone,
T2.address AS source_address,
T2.phone AS source_phone
FROM #Table1 T1
INNER JOIN #Table2 T2
ON T1.gender = T2.gender
AND T1.birthdate = T2.birthdate)
UPDATE CTE
SET tgt_address = source_address,
tgt_phone = source_phone
Deterministic methods
MERGE would throw an error rather than accept non deterministic results
MERGE #Table1 T1
USING #Table2 T2
ON T1.gender = T2.gender
AND T1.birthdate = T2.birthdate
WHEN MATCHED THEN
UPDATE SET address = T2.address,
phone2 = T2.phone;
Or you could pick a specific record if there is more than one match
With APPLY
UPDATE T1
SET address = T2.address,
phone2 = T2.phone
FROM #Table1 T1
CROSS APPLY (SELECT TOP 1 *
FROM #Table2 T2
WHERE T1.gender = T2.gender
AND T1.birthdate = T2.birthdate
ORDER BY T2.PrimaryKey) T2
.. Or a CTE
WITH T2
AS (SELECT *,
ROW_NUMBER() OVER (PARTITION BY gender, birth date ORDER BY primary key) AS RN
FROM #Table2)
UPDATE T1
SET address = T2.address,
phone2 = T2.phone
FROM #Table1 T1
JOIN T2
ON T1.gender = T2.gender
AND T1.birthdate = T2.birthdate
AND T2.RN = 1;