sql - What does ON [PRIMARY] mean? - Stack Overflow
When you create a database in Microsoft SQL Server you can have multiple file groups, where storage is created in multiple places, directories or disks. Each file group can be named. The PRIMARY file group is the default one, which is always created, and so the SQL you've given creates your table ON the PRIMARY file group. See MSDN for the full ...
sql server - What is the meaning of the prefix N in T-SQL …
This means the data type of NAME column and string 'JON' are different and so SQL Server implicitly converts one operand’s type to the other. If the SQL Server converts the literal’s type to the column’s type then there is no issue, but if it does the other way then performance will get hurt because the column's index (if available) wont ...
What does <> (angle brackets) mean in MS-SQL Server?
2013年11月8日 · <> operator means not equal to in MS SQL. It compares two expressions (a comparison operator). When you compare nonnull expressions, the result is TRUE if the left operand is not equal to the right operand; otherwise, the result is FALSE. If either or both operands are NULL, see the topic SET ANSI_NULLS (Transact-SQL). See here : Not Equal To
Why do table names in SQL Server start with "dbo"?
2009年6月30日 · DBO is the default schema in SQL Server. You can create your own schemas to allow you to better manage your object namespace. As a best practice, I always add the "DBO." prefix even though it is not necessary. Most of the time in SQL it's good to be explicit.
sql - CREATE TABLE [dbo]. [Table] - what does the dbo part mean ...
2013年11月9日 · Why do table names in SQL Server start with "dbo"? 13. SQL Server Tables Named With dbo Schema. Related. 401.
sql - What does collation mean? - Stack Overflow
2010年12月27日 · @C.B.: If you mean something like selecting all rows where a column's value equals 'Aéreo' and SQL S. returns rows with 'aereo', 'aereó', 'AerEO' and the like - yes, setting a specific collation for just a query can do that.
What is "with (nolock)" in SQL Server? - Stack Overflow
2009年3月27日 · 1) Pre-2005 sql server database that needs to run long query against live OLTP database this may be the only way. 2) Poorly written application that locks records and returns control to the UI and readers are indefinitely blocked.
What does double bars (||) mean in SQL? - Stack Overflow
@Martin: I know, but the DBMS is relevant quite often; it's a good habit to get into. SQL Server uses '+' as a string concatenation operator, for instance. (Of course, the better solution would have been for the poster to simply run the query without the count() to see what it did in the first place instead of posting here.) –
stored procedures - What does <> "~" mean in SQL - Stack …
2013年8月30日 · All SQL server versions after 2014 supports '~' operator, its bitwise not operator. I use it mostly to invert value of some flags (bit columns) in my DB. You can see more here .
sql server - What is the use of the square brackets [] in sql ...
The Microsoft book for SQL course says "You should use two-part names to refer to tables in SQL Server databases, such as Sales.Customer" so they don't ask to surround namespace with square bracket but if I remember correctly, surrounding them puts it in the right namepsace.