How to implement mysql multi-table query

Explanation

1. Query is actually a recursive call to each table, which is the same as matrix multiplication. This correspondence is very intuitive and very universal.

2. Conventional query actions are implemented through the sub_select function. This function is essentially execution.

Example

tsecer_select()
{
for (r = first ; r != end ; r = next)
{
if(sofartest())
{
nexttable.tsecer_select()
}
}
}

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