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ST_SetStartPoint() - TEXT Point
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:memory: #use in-memory database
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SELECT ST_SetStartPoint(GeomFromText('LINESTRING(0 0, 1 0, 1 1)'), 'alpha')
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1 # rows (not including the header row)
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ST_SetStartPoint(GeomFromText('LINESTRING(0 0, 1 0, 1 1)'), 'alpha')