If the column has a unique index: no, it’s no faster a non-unique index: maybe, because it will prevent sending any additional rows beyond the first matched, if any exist no index: sometimes if 1 or more rows match the query, yes, because the full table scan will be halted after the first row is … Read more
Let me guess: you’ve stumbled upon concept of named queries and you wonder where it fits in SQL. Well, from my knowledge, named queries haven’t got anything to do with “pure” SQL, but they’re a concept found in various ORM (object relational mapping) frameworks, ala Java Persistence API. Basically, a named query is one way … Read more
Disclamer This is just some additional information that might help anyone. I want to make it abundantly clear that what I am describing here is possibly: A. not 100% correct and B. not safe in terms of network security. I am not a DBA, but every time I find myself setting up a SQL Server … Read more
CREDENTIAL_USER { ASC_ID, name, ITEM}, CREDENTIAL_USER { MONTH, YEAR, ASC_ID} both contain ASC_ID so ASC_ID becomes ambiguous in select query. Select your data column wise and give separate alias for each column
This is the syntax you need: CASE WHEN countries LIKE ‘%’+@selCountry+’%’ THEN ‘national’ ELSE ‘regional’ END Although, as per your original problem, I’d solve it differently, splitting the content of @selcountry int a table form and joining to it.
There are CHECKSUM(*), BINARY_CHECKSUM(*) and CHECKSUM_AGG. They do CRC32 like checkum, but for detecting changes to a row it should be more than enough (you are talking about 1 in 4 billion chances for a false negative collision). Doing a cryptographic hash using HASHBYTES requires you to construct an expression representing the ‘row’.
WHERE dob < add_months( trunc(sysdate), -12*20 ); would work assuming that you want to ignore the time component of sysdate.
Try Case SELECT stock.name, CASE WHEN stock.quantity <20 THEN ‘Buy urgent’ ELSE ‘There is enough’ END FROM stock
This expression 12-4-2005 is a calculated int and the value is -1997. You should do like this instead ‘2005-04-12’ with the ‘ before and after.