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new help texts for operators

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astroidex 2013-09-15 17:12:57 +02:00
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<h3>AND logical operator</h3>
Returns 1 when condition a and b are true.
<h4>Syntax</h4>
<pre> condition a AND condition b </pre>
<h4>Arguments</h4>
None
<h4>Example</h4>
<pre> 4 = 2+2 AND 1 = 1 &rarr; returns 1 </pre>
<pre> 4 = 2+2 AND 1 = 2 &rarr; returns 0 </pre>

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<h3>LIKE expression</h3>
Returns 1 if the first parameter matches case-insensitive the supplied pattern. ILIKE can be used instead of LIKE to make the match case-insensitive. Works with numbers also.
<h4>Syntax</h4>
<pre>string/number LIKE pattern</pre>
<h4>Arguments</h4>
None
<h4>Example</h4>
<pre> 'A' ILIKE 'A' &rarr; returns 1 </pre>
<pre> 'A' ILIKE 'a' &rarr; returns 1 </pre>
<pre> 'A' ILIKE 'B' &rarr; returns 0 </pre>

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<h3>IS expression</h3>
Returns 1 if a is the same as b.
<h4>Syntax</h4>
<pre>a is b</pre>
<h4>Arguments</h4>
None
<h4>Example</h4>
<pre> 'A' IS 'A' &rarr; returns 1 </pre>
<pre> 'A' IS 'a' &rarr; returns 0 </pre>
<pre> 4 IS 4 &rarr; returns 1 </pre>
<pre> 4 IS 2+2 &rarr; returns 1 </pre>
<pre> 4 IS 2 &rarr; returns 0 </pre>
<pre> 4 IS 2 &rarr; returns 0 </pre>
<pre> $geometry IS NULL &rarr; returns 0, if your geometry is not NULL</pre>

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<h3>LIKE expression</h3>
Returns 1 if the first parameter matches the supplied pattern. Works with numbers also.
<h4>Syntax</h4>
<pre>string/number LIKE pattern</pre>
<h4>Arguments</h4>
None
<h4>Example</h4>
<pre> 'A' LIKE 'A' &rarr; returns 1 </pre>
<pre> 'A' LIKE 'a' &rarr; returns 0 </pre>
<pre> 'A' LIKE 'B' &rarr; returns 0 </pre>

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<h3>NOT</h3>
Returns 1 if a is not the same as b.
<h4>Syntax</h4>
<pre> a NOT b </pre>
<h4>Arguments</h4>
None
<h4>Example</h4>
<pre> 'a' IS NOT 'b' &rarr; returns 1 </pre>
<pre> 'a' IS NOT 'a' &rarr; returns 0 </pre>
<pre> 4 IS NOT 2+2 &rarr; returns 0 </pre>

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<h3>OR logical operator</h3>
Returns 1 when condition a or b is true.
<h4>Syntax</h4>
<pre> condition a OR condition b </pre>
<h4>Arguments</h4>
None
<h4>Example</h4>
<pre> 4 = 2+2 OR 1 = 1 &rarr; returns 1 </pre>
<pre> 4 = 2+2 OR 1 = 2 &rarr; returns 1 </pre>
<pre> 4 = 2 OR 1 = 2 &rarr; returns 0 </pre>