Assessment of Urban Water Supply System Based on Query Optimization Strategy

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Query strategy</td><td class="align_center">Semijoin program</td><td class="align_center">Overhead</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">E.ENO⟶station 2</td><td class="align_center">G∝<sub>ENO</sub>E</td><td class="align_center">120</td></tr><tr><td class="align_left">J.JNO⟶station 2</td><td class="align_center">G∝<sub>JNO</sub>J</td><td class="align_center">200</td></tr><tr><td class="align_left">GENO⟶station 1</td><td class="align_center">E∝<sub>ENO</sub>G</td><td class="align_center">120</td></tr><tr><td class="align_left">E⟶station 3</td><td class="align_left"> </td><td class="align_center">1200</td></tr><tr><td class="align_left">G station 3</td><td class="align_left"> </td><td class="align_center">360</td></tr><tr><td class="align_left">Total overhead</td><td class="align_left"> </td><td class="align_center">2000</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>SDD-1 algorithm search strategy.</div>

Complexity

tab3

Table 3

Table 3: Assessment of Urban Water Supply System Based on Query Optimization Strategy 