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# ST_LineSubstring
Introduction: Return a linestring being a substring of the input one starting and ending at the given fractions of total 2d length. Second and third arguments are Double values between 0 and 1. This only works with LINESTRINGs.
![ST_LineSubstring](../../../image/ST_LineSubstring/ST_LineSubstring.svg "ST_LineSubstring")
Format:
`ST_LineSubstring (geom: Geometry, startfraction: Double, endfraction: Double)`
Return type: `Geometry`
Since: `v1.0.1`
SQL Example
```sql
SELECT ST_LineSubstring(ST_GeomFromWKT('LINESTRING(25 50, 100 125, 150 190)'), 0.333, 0.666)
```
Output:
```
LINESTRING (69.28469348539744 94.28469348539744, 100 125, 111.70035626068274 140.21046313888758)
```