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Avoid using ISNULL in a WHERE or JOIN because it makes the columns &quot;nonsargable&quot;. &nbsp;In this case, the OR may still cause performance issues, but the rule about <b>not</b> using ISNULL is still correct.<br />
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WHERE ((yearren &gt;&nbsp;0 AND yearren &gt;&nbsp;2000) OR ((yearren IS NULL OR yearren = 0) AND yearcon &gt;&nbsp;2000))
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Avoid using ISNULL in a WHERE or JOIN because it makes the columns "nonsargable".  In this case, the OR may still cause performance issues, but the rule about not using ISNULL is still correct.

WHERE ((yearren > 0 AND yearren > 2000) OR ((yearren IS NULL OR yearren = 0) AND yearcon > 2000))

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I have two fields in a table - yearcon and yearren. &nbsp; &nbsp;<br />
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<pre><code id="code-10-28933269-1">select yearren, yearcon from property</code></pre>
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If yearren is populated I want to look at that field in the where statement and if not, look at the yearcon field.<br />
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<pre><code id="code-10-28933269-2">where if(yearren &gt; 0, yearren, yearcon) &gt; 2000</code></pre>
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Can someone help me? &nbsp; I have the flu and my brain doesn't work!
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I have two fields in a table - yearcon and yearren.    

(CODE)

If yearren is populated I want to look at that field in the where statement and if not, look at the yearcon field.

(CODE)

Can someone help me?   I have the flu and my brain doesn't work!

SQL Where statement and conditional selecting

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.