Check out example codes for "b-table-column v-slot undefined". It will help you in understanding the concepts better.
Code Example 1
<b-table :data="myData">
<template slot-scope="props">
<b-table-column field="name" label="Name">
{{ props.row.name }}
</b-table-column>
<b-table-column field="age" numeric label="Age">
{{ props.row.age }}
</b-table-column>
</template>
</b-table>
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