Temp table Limitation

Temp tables are constructs which exist for a limited time in SQL Server, usually the lifetime of a connection. There are a few restrictions for temp tables, like they cannot be partitioned and cannot have FKs. They can have indexes and constraints.  Temporary tables cannot be partitioned Temporary tables cannot reference or be referenced by FOREIGN KEY constraints When a session creates temporary table that contains a named constraint inside a transaction, another sessions cannot create a temporary table of the same name until the first session commits the transaction.

Retrieve the files (data file, and log files) name and location path fron sql server backup file

Retrieve the files (data file, and log files) name and location path fron sql server backup file say abc.bak

By using the following sql statement we can retrieve the same :)

RESTORE FILELISTONLY FROM DISK='E:\abc.bak'

-- Recursive CTE to return the management chain leading all the way up to the CEO for a specified employee

-- Recursive CTE to return the management chain leading all the way up to the CEO for a specified employee

With EmpCTE as(
Select empid,mgrid, firstname, lastname, 0 as distance
from HR.Employees
where empid = 9

Union ALL

Select M.empid,M.mgrid, M.firstname, M.lastname, S.distance+1 as distance
from EmpCTE As S
Inner Join HR.Employees As M ON M.empid = S.mgrid
)
Select * from EmpCTE

NOT IN as same with <> ALL

NOT IN
========
SELECT *
 FROM Emptable
 WHERE (Departmentid NOT IN (SELECT Departmentid
                              FROM Emptable AS Emptable_1
                              WHERE (Empid < 5)
                             )
        )
 GO

<> ALL
======
SELECT *
 FROM Emptable
 WHERE (Departmentid <> ALL (SELECT Departmentid
                              FROM Emptable AS Emptable_1
                              WHERE (Empid < 5)
                             )
        )
 GO

***both query will produce same output.

Why we prefer COALESCE standard function instead of ISNULL Non-standard function

-- Why we prefer COALESCE standard function instead of ISNULL Non-standard function
-- Execute the  following sql statement and judge the output


DECLARE
    @x AS VARCHAR(3) = NULL,
    @y AS VARCHAR(10) = '1234567890';

SELECT ISNULL(@x,@y) AS [ISNULL], COALESCE(@x,@y) AS [COALESCE]

SQL Server db backup related information

SQL Server db backup related information

SQL Server holds all db backup related information into the following tables:-

1.      SELECT * FROM msdb.dbo. backupset

2.      SELECT * FROM msdb.dbo.backupmediafamily

We may use the following query, to find the important backup related information

---- SQL statement start

select  top 5 a.server_name, a.database_name, backup_finish_date, a.backup_size,

CASE a.[type] -- Let's decode the three main types of backup here

 WHEN 'D' THEN 'Full'

 WHEN 'I' THEN 'Differential'

 WHEN 'L' THEN 'Transaction Log'

 ELSE a.[type]

END as BackupType

 ,b.physical_device_name

from msdb.dbo.backupset a join msdb.dbo.backupmediafamily b

  on a.media_set_id = b.media_set_id

where a.database_name Like 'Paylite4Alubaf%' -- databasename

order by a.backup_finish_date desc

--- SQL statement end

SQL Services Reporting Services - SSRS [Pros & Cons]

SQL Services Reporting Services - SSRS

• Pros
  • Flexibility in defining specific formatting and layout, specific item placement, multiple or composite report items, groups, headers, footers, subtotals
  • Report caching and snapshot for better performance especially if the source data query is complex and takes longer to execute
  • Creating report subscription for automatic report delivery via email or file share mode
  • Can combine multiple data sources (relational and OLAP data) into a single report
  • Additional charting options – map, area, range, scatter, polar, 3D, sparklines, data bars, etc
  • As similar as PPS dashboard, SSRS reports can also be deployed on a SharePoint site for collaboration
• Cons
  • Harder to create dashboards and therefore often done by IT people
  • No automatic drill-through and drill-across features