SQL WITH clause example - Stack Overflow
2012年9月23日 · 354 The SQL WITH clause was introduced by Oracle in the Oracle 9i release 2 database. The SQL WITH clause allows you to give a sub-query block a name (a process also called …
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 …
How do I perform an IF...THEN in an SQL SELECT?
2008年9月15日 · 117 You can find some nice examples in The Power of SQL CASE Statements, and I think the statement that you can use will be something like this (from 4guysfromrolla):
The SQL OVER () clause - when and why is it useful?
The SQL OVER () clause - when and why is it useful? Asked 14 years, 7 months ago Modified 2 years, 9 months ago Viewed 384k times
LEFT JOIN vs. LEFT OUTER JOIN in SQL Server - Stack Overflow
2009年1月2日 · Left Join and Left Outer Join are one and the same. The former is the shorthand for the latter. The same can be said about the Right Join and Right Outer Join relationship. The …
SQL: IF clause within WHERE clause - Stack Overflow
2008年9月18日 · Is it possible to use an IF clause within a WHERE clause in MS SQL? Example: WHERE IF IsNumeric(@OrderNumber) = 1 OrderNumber = @OrderNumber ELSE OrderNumber …
Using RegEx in SQL Server - Stack Overflow
2012年1月19日 · On-prem Microsoft SQL Server will gain the same regex feature in the next major release ("vNext" as they say; so, that'll be SQL Server 2025 presumably). The new set of functions is …
sql - Exclude a column using SELECT * [except columnA] FROM tableA ...
SELECT @SQL = 'SELECT ' + @SQL + ' FROM ' + @TableName EXEC (@SQL) UPDATE: You can also create a stored procedure to take care of this task if you use it more often. In this example I …
SQL 'LIKE' query using '%' where the search criteria contains
2012年5月29日 · These examples deal specifically with escaping characters in Oracle. Let's say you wanted to search for a % or a _ character in the SQL LIKE condition. You can do this using an …
sql - What are DDL and DML? - Stack Overflow
2010年4月5日 · I have heard the terms DDL and DML in reference to databases, but I don't understand what they are. What are they and how do they relate to SQL?