Guides/ReportDesign/3.0-Data-sources-tab.md
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By checking the 'Allow nulls' checkbox, you tell the system to use an OUTER JOIN as its [[join type|http://wiki.izenda.us/FAQ/Questions/Different-Join-Types-and-Filters]]. But the particular OUTER JOIN type used depends on what mode you use. For Simple mode, a FULL OUTER JOIN is used when the 'Allow nulls' checkbox is checked.
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-![allow nulls simple]()
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+![allow nulls simple](/Guides/ReportDesign/3.0-Data-sources-tab/data_sources_checkboxes_allow_nulls.png)
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Below is the SQL generated from this selection:
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For Advanced mode, a **LEFT OUTER JOIN** will be used instead of the normal join when 'Allow nulls' is checked.
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-![Allow nulls advanced]()
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+![Allow nulls advanced](/Guides/ReportDesign/3.0-Data-sources-tab/data_sources_advanced_allow_nulls.png)
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##3.4 Join Types
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