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12) report output and Query Join

The Query Join ..
to understand what a union query, we can think of these two tables as if they were two sets: set A =
Table 1 and Table 2 with B =

intersecting the two together you are seeking: a shared area and two separate areas. The different types of joins involved in these select areas estrapolondo different result sets. On the basis of whether or not the condition (WHERE), the Inner Join returns only the existing record occurred in both tables, all those rows that have no correspondence will be excluded. In the case of the sets are going to consider only the part that overlaps. In the case of the table we have: 1 -> architecture -> gino -> 1
The outer join returns all records that do not match the search keywords. It 's the opposite of inner join. In fact it uses together with left / right becoming left outer join or right outer join. In the case of bodies to better understand, everything that is selected is out dall'intersecazione (on the right or / and left).
The left outer join, put together the concept of inner join and outer join. The result obtained is the selection of all records of table A and B that match the table, the more records in Table A that do not match. The records that do not match are valued at null. There is also a right outer join, but normally not in use and to obtain the same result can change the order of tables.

remember that every object within a database can be any object can be created, stored, used, modified, and using tables, forms and queries can also edit the data. (Types of objects in a DB: - tables: data containers, relational-query: data operations, consultation, or change tabs: visual interfaces for accessing data-report: production of macro-prints: sequences of operations pre-registered and re-execute a command-modules: applications programmed). A

Query on multiple tables has, like automatic join predicates, relations defined on the DB but in the absence of predefined reports the join predicates are established as graphically reports (they set up the referential integrity constraints: one by one and many to many. When updating and deleting a record, you can request to update or prevent 'operation).
The results of a query is a view of data that can be manipulated as a table. The views obtained from query clusters can not be changed while the views to query via joins are directly editable. The
REPORT instead is the tool we need for print production, to customize the headers, to define groups and subgroups, to calculate totals on the groups.
STATISTICAL REPORTING: It 's the first type of application of decision support. Usually consists of a program / script that retrieves the operational data via a language such as SQL presentado doing some processing and so the result table. It 'called static because the logic and the output format is defined once and for all and requires a programmer to be changed.