#DTSQL TOOL HOW TO#
#DTSQL TOOL UPDATE#

How many types of functions (UDF) are there in SQL Server? What are inline functions? – Scalar functions – Inline Table-valued functions – Multi-statement Table-valued functions More Info: Ģ4. What are XML indexes, what is their use? More Info: Ģ3. What new indexes are introduced in SQL Server 2005 in comparison to 2000? – Spatial – XML More Info: Ģ2. What are CUBE & ROLLUP sets? CUBE & ROLLUP are the grouping sets used with GROUP BY clause and are very helpful in creating reports.

#DTSQL TOOL UPDATE#

Use MERGE statement to INSERT any new record form the Feed table, update any existing record in Master table and DELETE existing records in Master table that is not present in Feed table.Ģ0. Feed table gets truncated and re-populated every day.Ĭreate a job with an optimal script that will update the Master table by the Feed table. There are two tables one Master and another Feed table, both with 2 columns: ID & Price.

But by default creation of PK automatically creates a clustered index upon the table, check here: ġ9. Can you create a Primary key without clustered index? Yes, you can create a Primary Key with a Non Clustered Index. Check my all blog posts related to IDENTITY: ġ8. What is an IDENTITY column and its usage in INSERT statements? IDENTITY column can be used with a tables column to make it auto incremental, or a surrogate key. What should be the ideal combination with IN & UNION (ALL) in terms of performance? a. Difference between Temporary Table and Table Variable. Difference between COALESCE() & ISNULL() More Info: ġ5. EXEC sp_executesql, EXECUTE() More Info: ġ4. Multiple ways to execute a dynamic query. This will help in deploying the pkg created in DEV server to Testing and finally to the PROD environment. How will you migrate an SSIS package from Development to Production environment? Do not include db connections and file paths in your workflow, instead create configuration files. OUTER LEFT/RIGHT JOIN with WHERE clause can act like an INNER JOIN if not used wisely or logically. Difference between LEFT JOIN with WHERE clause & LEFT JOIN with no WHERE clause. Why you should not use a cursor? What are its alternatives? Alternatives: while loops with temp tables, derived tables, correlated sub-queries, CASE stmt More Info: ġ1.

#DTSQL TOOL HOW TO#

More Info: Check how to use Cursors optimally: ġ0.

Fastest to slowest: Dynamic, Static, and Keyset. What are Cursors and their types? What type do you use most and which one is fast? FORWARD-ONLY, FAST-FORWARD or READ-ONLY cursors. How will you insert result set of the above proc in a table?ĩ. How can you execute a DOS command from SQL or through SQL query by using xp_cmdshell?Ĩ. What are extended stored procedures? Can you create your own extended stored-proc? More Info: ħ. – DELETE is DML just like INSERT, UPDATE, but TRANCATE is DDL, just like CREATE, ALTER, DROP More differences on Delete & Truncate: | YouTube.Ħ. If not then none of them can be rollbacked. – Both statements can be rolled backed if provided in a transaction (BEGIN TRANS). – TRUNCATE is faster than DELETE as Delete keeps log of each row it deletes in transaction logs, but truncate keeps log of only de-allocated pages in transaction logs. Difference between DELETE & TRUNCATE statement? Which statement can be Rollbacked? – With DELETE we can provide conditional WHERE clause to remove/delete specific rows, which is not possible with TRUNCATE. How can you execute an SQL query from command prompt? OSQL & SQLCMD More Info: –Part-I.htmĥ. What is SQL Profiler? What it does? What template do you use? More Info: Ĥ. What tools do you use for performance tuning? Query Analyzer, Profiler, Index Wizard, Performance Monitor Link: ģ. … I’ll be updating this post with more questions.Ģ. These are the following common question that I faced in various TSQL interviews. 1) Write a sql statement to create a simple table countries including column country_id,country_name and continent.

Dtsql tool