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I am new to SQL can someone help me understand why do we use Select .* in sql server ? And why is it different from just select * from table name
In some cases we use statements like select .*, firstname , lastname from employee. Just a bit confused.
.* means, select all columns of a table
SELECT A.*,B.Id from A,B select all columns of A and only Id column of B.
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Is the below recursive CTE statement, without a UNION ALL, syntactically valid? If it is should it return an error?
I have tried it on Mysql by adding the 'recursive' keyword after 'WITH' and it returns 3573 error. Informix on the other hand accepts the syntax but runs in a loop.
CREATE TABLE A(id int);
WITH T
AS (SELECT id FROM A, T)
SELECT id FROM T;
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I have this code:
SELECT
ZONE_NAME,
ORG_ID,
ORG_SHORT_NAME,
XMSSN_USE
FROM TABLEZ
;
UPDATE TABLEZ
SET TABLEZ.BILL_CYCLE = '1-DEC-2020 4' WHERE (SELECT TABLEZ.XMSSN_USE WHERE TABLEZ.XMSSN_USE=224)
But it doesn't seem to execute. What could be the problem?
You have 2 different query sentences. You should use ; after first query and then write the update query.
Also you need to use some field on the where clause, your where is empty.
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I need to remove repeated records in search result. I have 3 columns (id, worklevel & umobile).
It looks like below:
Red places is repeat but I need just one of them in result.
Try using DISTINCT
SELECT DISTINCT column1, column2, ...
FROM table_name;
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From the above table, I want to remove the rows that have the duplicate CODE column. Out of the duplicate rows, the row with the smallest ID_CHECK should be retained.
Output:
If I understand correctly, this should be your SQL query:
Select Names, Code, ID_CHECK
FROM
(
Select Names, Code, ID_CHECK,
ROW_NUMBER() OVER(Partition by Name,Code Order By ID_CHECK) as rnk
FROM table
)tmp
WHERE tmp.rnk=1;
Let me know if this works.
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I have a table and I want to display the 3 names (Ted, Ringo, Paul) that have the most records using an SQL query.
It's a primitive question, but please help me.
my table:
SELECT TOP 3 Name
FROM YourTable
GROUP BY Name
ORDER BY COUNT(*) DESC