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Published byOpal Williamson Modified over 9 years ago
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FIA Forest Inventory Analysis Plots in forests over the US –Coordinates “fuzzed” at 1km –Tree species and characteristics –Resampled every decade FIA database: –Downloadable by state –CSV files or MS-Access –“CN” for primary keys –Includes complete database dictionary!
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MS-Access Part of MS-Office professional Relational database –No concurrent access –No spatial extensions Has some unique characteristics –Brackets on field names: [Field1] “Easy to Use” wizards for queries –Can get to SQL statements behind the wizards
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Query Wizards
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Select Tables and Fields
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Missing Relationships
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FIA Relationships
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Query Options
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Add Tables
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Add Tables (con’t)
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Adding Joins Drag to Join Tables
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SQL View SELECT PLOT.[CN] FROM (PLOT INNER JOIN TREE ON PLOT.CN = TREE.PLT_CN) INNER JOIN REF_SPECIES ON TREE.SPCD = REF_SPECIES.SPCD;
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Add Field to Select
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Select the field
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Final Query – Wizard View
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Datasheet View
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SQL View
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Sorting
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Filtering
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MS-Access Access uses “*” for a string wildcard Fieldnames are in brackets (sometimes) First “INNER JOIN” must be in parenthesis
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Final Query SELECT PLOT.[CN], PLOT.LAT, PLOT.LON, REF_SPECIES.COMMON_NAME, TREE.HT FROM (PLOT INNER JOIN TREE ON PLOT.CN = TREE.PLT_CN) INNER JOIN REF_SPECIES ON TREE.SPCD = REF_SPECIES.SPCD WHERE (((REF_SPECIES.COMMON_NAME) Like 'Doug*') AND ((TREE.HT)>200)) ORDER BY TREE.HT DESC;
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