When this component's checkboxType is configured to Multi or Single, the base datatable emits a rowselection event which can be handled by any parent LWC:

// datatable.js case 'rowselection': { this.dispatchEvent( new CustomEvent('rowselection', { detail: { selectedRows: this.selectedRows }, bubbles: true, composed: true }) ); break; }

<c-soql-datatable ... onrowselection={handleRowSelection} ... ></c-soql-datatable>

handleRowSelection(event) { console.log(event.detail.selectedRows); }

This component also outputs selectedRows and firstSelectedRow to Flow screens as output variables.

See the soqlDatatable specification section for details.