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Is the | | (bars) combining the numbers?
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yes, that's the string concatenation symbol
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yes, that's the string concatenation symbol

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Can someone explain what this line below is accomplishing. I am fairly new to PLSQL. &nbsp;<br />
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substr(max((lpad(percent,1<wbr />0,'0') | | line_num)),11,6)
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Can someone explain what this line below is accomplishing. I am fairly new to PLSQL.  

substr(max((lpad(percent,10,'0') | | line_num)),11,6)

Query substr

Oracle is an object-relational database management system. It supports a large number of languages and application development frameworks. Its primary languages are SQL, PL/SQL and Java, but it also includes support for C and C++. Oracle also has its own enterprise modules and application server software.