This section mainly introduces how to construct the SQL query expression and query based on the SQL statement. And provide the samples about SQL query.
### Construct SQL Query Expression
Take the sample data as an example, introduce the construction of the common query conditional expressions.
Introduce use the SQL statements to query in the SuperMap iDesktop.
### Introductions about how to construct a SQL query function
Introduce commonly used functions when constructing a query function.
Introduce how to realize the SQL query to the related data through setting connection table.
### Use SQL Query to Group Statistics
Take the sample data as an example, introduce how to conduct group statistics for one or multiple fields in detail.
### Use SQL Query to Sort Filed
Take the sample data as an example, introduce how to sort the SQL query results.