a database query is a request for data from a database management system (dbms). it allows you to retrieve, manipulate, and analyze data stored in the database by using structured query language (sql) statements. how can i write an effective database query? to write an effective database...
I am using the following piece of code to retrieve the SQL to the DTO on the BLL. result.data = _dbContext.Database.SqlQuery<sysmstatusgroup_dto>(sqlFinal).ToList(); but then i get an error which says that i cannot use SqlQuery anymore on the new entity framework. Is there a wor...
Learn How to create and manage a database in SQL, this is the place to start! you will be rewarded with learning some very dry material,The classic SQL Query for iPad, iPhone and iPod touch. “SQL Query “is a perfect tool for studying, complex , daily use SQL Query in company ...
Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created uisng T-SQL Pivot Table query Adding a partition scheme to an existing table. Adding a Value to a 'date' Co...
Final Thoughts on How to Perform a Search and Replace in SQL In this blog, we learned how to update a string in a table column using a four step process. By building up the query as a series of SELECT statements, we can minimize the risk of inadvertently changing data that we did not...
I have a Spark sql query that works when I execute from inside a Jupyter Notebook that has a a PySpark kernel but fails when I execute it submitting to a Livy session. Usually there's no difference when I execute my queries both ways. I tried to get the spark session pa...
first time and data access patterns may change over time. In terms of optimization, the firstthing we want to do is get this query using an index and not using a full scan. For this, we want to look at the clause: where username = “admin1”. With this column theoretically ...
. While I would like to think of myself as of a brilliant mind or genius or add something like “query magician” to my social network profiles, well, writing complex SQL wouldn’t be the only thing required to do that. Therefore, in this article, I’ll try to cover the “magic” ...
Hi I am working on a project where we have to migrate the database from oracle to db2. There is a query which picks up certain percentage of records...
A SQL update with join is a query used to update the data in a table based on data in another related table. The join is used to associate records in one