The homepage of Jianshetong official website contains the search content of construction enterprises, including many convenient information sections such as checking enterprises, checking credit and checking personnel. Jianshetong is a software created by Zhong Da Consulting to promote fair competition and transparent development of construction enterprises. It is used to query and publish records of honest behaviors of all parties in the construction market and integrate information resources such as commendation awards, qualifications and qualifications.
Free means free compared with fees; All kinds of tangible or intangible things that are not collected and supplied in the form of currency exchange.
Query means that users select all or part of data from tables or other queries by setting some query conditions, and display the data in the form of tables for users to browse.
Query is an independent and powerful database object with computing function and conditional retrieval function. Query means that users select all or part of data from tables or other queries by setting some query conditions, and display the data in the form of tables for users to browse. A query is a collection of operations, not records. The queried recordset does not actually exist. Every time a query is used, a recordset is created from the data source table or query provided when the query is created. Therefore, a query is a regenerated table with a table or query as the data source, and the result of the query is always synchronized with the data in the data source.
In a computer, user input into a search engine or database is usually called a query. Query (verb) is to submit a query request.
Select query
Select query is the most commonly used query method, which can be used not only for multi-condition combination query, but also for user-defined query, statistical query of "sum value" and "mean value", and sorting the results if necessary.
Cross-table query
Cross-table query usually takes one field as the row header of the table and the value of another field as the column header to obtain the summary information of the data at the cell where the row and column intersect, so as to achieve the purpose of data statistics. Crosstab queries can be created through the Crosstab Query Wizard or in design view.
Parameter query
Parameter query is a dynamic query. You can enter different criteria values each time you run the query. The system determines the query result according to the given parameter value, but it is not necessary to define the parameter value when creating the query. This kind of query is completely controlled by users, which can adapt to the changing needs of applications to a certain extent and improve the query efficiency. Parameter queries are generally created on the basis of select queries. When you run a query, one or more dialog boxes will appear, asking for query conditions. Because of the randomness of parameters, the query results have great flexibility, so they often become the data basis of forms, reports and other objects.
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