What does <> (angle brackets) mean in MS-SQL Server?
2013年11月8日 · In My Query one place some other developer using <> (angle brackets) What does it mean ? sb.append (" AND nvl (VoidFlag, 'N') <> 'Y' ");
What does SQL Select symbol || mean? - Stack Overflow
2014年4月29日 · sql server: + (infix operator), concat ( vararg function ) Edit : Now Azure SQL also supports ANSI SQL standard || operator for string concatenation. Docs link.
What does the "@" symbol do in SQL? - Stack Overflow
2012年7月30日 · The @CustID means it's a parameter that you will supply a value for later in your code. This is the best way of protecting against SQL injection. Create your query using parameters, rather than concatenating strings and variables. The database engine puts the parameter value into where the placeholder is, and there is zero chance for SQL injection.
sql - Not equal <> != operator on NULL - Stack Overflow
2014年10月9日 · In SQL, anything you evaluate / compute with NULL results into UNKNOWN This is why SELECT * FROM MyTable WHERE MyColumn != NULL or SELECT * FROM MyTable WHERE MyColumn <> NULL gives you 0 results. To provide a check for NULL values, isNull function is provided. Moreover, you can use the IS operator as you used in the third query.
Should I use != or <> for not equal in T-SQL? - Stack Overflow
2009年4月6日 · Yes; Microsoft themselves recommend using <> over != specifically for ANSI compliance, e.g. in Microsoft Press training kit for 70-461 exam, "Querying Microsoft SQL Server", they say "As an example of when to choose the standard form, T-SQL supports two “not equal to” operators: <> and !=. The former is standard and the latter is not.
sql - find records from previous x days? - Stack Overflow
2018年2月12日 · How can I come up with a stored procedure that selects results for past 30 days? where MONTH(RequestDate) > 6 and DAY(RequestDate) >= 10 and MONTH(RequestDate) < 21 and DAY(RequestDate) ...
SQL Server CASE .. WHEN .. IN statement - Stack Overflow
2011年5月18日 · On SQL server 2005 I am trying to query this select statement SELECT AlarmEventTransactionTableTable.TxnID, CASE AlarmEventTransactions.DeviceID WHEN DeviceID IN( '7 ...
sql - NOT IN vs NOT EXISTS - Stack Overflow
Which of these queries is the faster? NOT EXISTS: SELECT ProductID, ProductName FROM Northwind..Products p WHERE NOT EXISTS ( SELECT 1 FROM Northwind..[Order Details] od WHERE p.
sql - ORA-00904: invalid identifier - Stack Overflow
2011年5月17日 · I tried to write the following inner join query using an Oracle database: SELECT Employee.EMPLID as EmpID, Employee.FIRST_NAME AS Name, Team.DEPARTMENT_CODE AS TeamID, T...
How do I perform an IF...THEN in an SQL SELECT?
2008年9月15日 · The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server. SELECT CAST( CASE WHEN Obsolete = 'N' or InStock = 'Y' THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product You only need to use the CAST operator if you want the result as a Boolean value. If you are happy with an int, this works: SELECT CASE WHEN …