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La Master Class SQL Server, c'est 5 des meilleurs spécialistes français de SQL Server qui animent chacun un jour complet de workshop sur leur domaine d’expertise. Durant cette semaine exceptionnelle, vous avez l’occasion d’accéder aux connaissances les plus pointues sur l’optimisation et le diagnostic SQL Server, en profitant de l’expérience et de la pédagogie des meilleurs.
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If you are an aspiring SQL technical consultant, or data scientist, or pursuing a degree in SQL to become a senior SQL analyst, you should know the role & importance of SQL databases in shaping your career. Deciphering the database management system, functions of the database system, updating, deleting, creating a record of data, and data modification will be key skills for data analysts,s and all we know is that it’s not a cup of tea for every student.
Knowledge of SQL queries is required for almost everyone in the IT field. Whether you are software developers, QA Engineers, data scientists, or a product guy, you are required to work with data in some way or the other. So, in the interviews for these profiles instead of directly asking questions based on theoretical concepts of databases, the interviewers ask SQL queries that test both the theoretical as well as practical understanding and usage of the different SQL concepts.
Read More:- rpatoolstutorial.com/top-sql-queries/
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Introduction
Suppose we have to see few of the records that are stored in the database. What do we do? We use SQL language to query the database and retrieve the required data.
SQL allows us to perform various transactions on the underlying database data. It allows the user to retrieve simple to complex request in an efficient way. The basic command used to retrieve the data from the database is SELECT. The basic structure of SQL query is as follows:
SELECT Column/s
FROM table_name/s
WHERE Condition/s;
That means any query would select a set of columns from list of tables based on their join conditions as well as any other filter conditions. It may pick one or more columns from one or more tables. Whenever more than one table is used in the query, the basic join condition to map these two tables should be used. This will relate the two tables in the query. In addition, we can specify any number of filter conditions to get the result.
We can have various types of operations like filtering, sorting, grouping etc on the records retrieved by SELECT query. Let us see all of them in details.
Select Operation
NULL Values
Sorting
Aggregation
Join Operation
Sub Queries
Correlated Sub Queries
Other Operations
- UNION
- MINUS
- INTERSECT
- RENAME
- DISTINCT
- LIKE
- ROWNUM
Conditional Control
Case Statement
Cursors
Mark Tabladillo - Enterprise Data Mining with SQL Server*: sqlsaturday.com/viewsession.aspx?sat=109&sessionid=6588