Multiple meta_key in one global $wpdb;

I have this code which works great:

global $wpdb;

$ticker_tag = $wpdb->get_col( "SELECT meta_value, COUNT(*) AS c 

FROM $wpdb->postmeta 

WHERE meta_key = 'ticker'   

GROUP BY meta_value 

ORDER BY c DESC" );

Is there any way to add two meta_key values?

I have tried:

WHERE meta_key = 'ticker', 'ticker2'

also tried this:

WHERE meta_key = 'ticker' AND 'ticker2'

but none of them works.

Answers:

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Method 1

Use WHERE meta_key = 'ticker' OR meta_key = 'ticker2'

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