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Tag: sql-server

SQL grouping by month and year

I’m not sure what should I write in the following SQL query to show ‘date’ column like this: “month-year” – “9-2011”. So, what I want to do is to change the data from the first column to show month and year instead of showing month only. Answer Or as @40-Love mentioned you can cast with leading zeroes:

Optimizing SELECT COUNT to EXISTS

I have a query to find certain customers from a table. There is an index on customerid, so the DB scans all rows with customerid = 22. Since the result is processed by checking whether the count returns zero or more than zero, how can I optimize the query? I.e. such that at the first customer row with amount <>

DISTINCT for only one column

Let’s say I have the following query. How can I modify it so that it returns no duplicate Emails? In other words, when several rows contain the same email, I want the results to include only one of those rows (preferably the last one). Duplicates in other columns should be allowed. Clauses like DISTINCT and GROUP BY appear to work

SQL Server VARBINARY(max) to c# byte[]

I am querying the table (one of the columns is a VARBINARY(MAX)) which returns some records. Then I save that as .dat.csv then I parse through that .dat file and get that varbinary value into a string by splitting the file based on commas. Now I need to convert this varbinary to byte array. How can I do that? Answer

CASE Statement in SQL

just a curious question. I have written following code using CASE statement but I don’t have data so I am not sure if my logic is correct. All I am doing is I am applying length check on each field …

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