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46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
<h3>Query Builder</h3>
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The query builder allows you to create provider specific filter expressions.
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These are usually evaluated much faster than the generic QGIS expressions, but
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are sometimes limited (e.g. for shape files) or behave diffently.
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<h4>Providers</h4>
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<table border=1>
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<tr>
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<th>Provider</th>
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<th>Documentation</th>
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</tr>
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<tr>
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<td>OGR</td>
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<td>where clauses depending on the
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<a href="http://www.gdal.org/ogr_formats.html">format</a> (eg.
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<a href="http://www.gdal.org/ogr_sql.html">OGR SQL</a>
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for shape files)
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</td>
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</tr>
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<tr>
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<td>PostgreSQL/PostGIS</td>
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<td>where clauses using
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<a href="http://www.postgresql.org/docs/">PostgreSQL</a> and
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<a href="http://postgis.net/documentation">PostGIS</a>
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</td>
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</tr>
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<tr>
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<td>SpatiaLite</td>
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<td>where clauses using
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<a href="http://www.sqlite.org/lang_select.html">SQLite</a> and
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<a href="http://www.gaia-gis.it/gaia-sins/spatialite-sql-4.2.0.html">SpatiaLite</a>
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</td>
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</tr>
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<tr>
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<td>Oracle Spatial/Locator</td>
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<td>where clauses using
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<a href="http://docs.oracle.com/cd/B28359_01/appdev.111/b28400/sdo_index_query.htm#autoId9">Oracle Spatial/Locator</a>
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</td>
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</tr>
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<tr>
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<td colspan=2>...</td>
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</tr>
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</table>
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