type: “button” should be used in columns attribute to display buttons in LWC lighting datatable.

Sample Code:

HTML:

<template>        
    <lightning-card title = "Search Accounts" icon-name = "custom:custom63">    
        <div class = "slds-m-around_medium">    
            <lightning-input type = "search" onchange = {handleKeyChange} class = "slds-m-bottom_small" label = "Search" >  
            </lightning-input>    
            <template if:true = {accounts}>                    
                <div style="height: 300px;">    
                    <lightning-datatable key-field="Id"  
                                         data={accounts}  
                                         columns={columns}  
                                         hide-checkbox-column="true"  
                                         show-row-number-column="true"  
                                         onrowaction={callRowAction}>  
                    </lightning-datatable>    
                </div>  
            </template>        
            <template if:true = {error}>    
                {error}>                    
            </template>    
        </div>    
    </lightning-card>    
</template>   

JAVASCRIPT:

import { LightningElement } from 'lwc';  
import fetchAccounts from '@salesforce/apex/AccountController.fetchAccounts';  
import { NavigationMixin } from 'lightning/navigation';  
  
const COLUMNS = [  
    { label: 'Id', fieldName: 'Id' },  
    { label: 'Name', fieldName: 'Name' },  
    { label: 'Industry', fieldName: 'Industry' },  
    { type: "button", typeAttributes: {  
        label: 'View',  
        name: 'View',  
        title: 'View',  
        disabled: false,  
        value: 'view',  
        iconPosition: 'left'  
    } },  
    { type: "button", typeAttributes: {  
        label: 'Edit',  
        name: 'Edit',  
        title: 'Edit',  
        disabled: false,  
        value: 'edit',  
        iconPosition: 'left'  
    } }  
];  

export default class accountSearchLWC extends NavigationMixin(LightningElement) {  
  
    accounts;  
    error;  
    columns = COLUMNS;  
  
    handleKeyChange( event ) {  
          
        const searchKey = event.target.value;  
  
        if ( searchKey ) {  
  
            fetchAccounts( { searchKey } )    
            .then(result => {  
  
                this.accounts = result;  
  
            })  
            .catch(error => {  
  
                this.error = error;  
  
            });  
  
        } else  
        this.accounts = undefined;  
  
    }      
      
    callRowAction( event ) {  
          
        const recId =  event.detail.row.Id;  
        const actionName = event.detail.action.name;  
        if ( actionName === 'Edit' ) {  
  
            this[NavigationMixin.Navigate]({  
                type: 'standard__recordPage',  
                attributes: {  
                    recordId: recId,  
                    objectApiName: 'Account',  
                    actionName: 'edit'  
                }  
            })  
  
        } else if ( actionName === 'View') {  
  
            this[NavigationMixin.Navigate]({  
                type: 'standard__recordPage',  
                attributes: {  
                    recordId: recId,  
                    objectApiName: 'Account',  
                    actionName: 'view'  
                }  
            })  
  
        }          
  
    }  
  
}  

JS-meta.xml:

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>55.0</apiVersion>
    <isExposed>true</isExposed>
    <targets>
        <target>lightning__Tab</target>
    </targets>
</LightningComponentBundle>

Apex Class:

public with sharing class AccountController {  
      
    @AuraEnabled( cacheable = true )  
    public static List< Account > fetchAccounts( String searchKey ) {  
        
        String strKey = '%' + searchKey + '%';  
        return [ 
            SELECT Id, Name, Industry 
            FROM Account 
            WHERE Name LIKE: strKey LIMIT 10 
        ];  
            
    }  
        
}

Output: