The data table in MSSQL database stores flight connections. ID field is the group of connected flights. ROUTE field is the flight connection; the value consists of a pair of connected flights concatenated by a short dash. LNO field is the serial order of each pair of connected flights.
Task: List the complete sequence of connections for each flight group (still use the short dash to connect flights) and arrange the sequences by flight group. Below is the expected result:
Write the following SPL code:
A1: Run the simple SQL; and pay attention to the data order.
A2: Group rows by ID and handle each group (represented by ~) – Split ROUTE field in each group by the short dash (-), concatenate them, remove neighboring duplicate flights (without sorting), and then concatenate the result with the short dash.
Source
SPL open source address
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