php - Values Cannot be read by MySQL? -

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i have query in mysql, have values in database there comma example (monday, tuesday). reads data if there 1 inside (monday) or (tuesday) when data more 1 , comma mysql doesn't read it. i've tried charindex didn't work or maybe used wrong syntax. help.

here's snippet want read data

if (date_format(ts.`date`, '%w') <>  r.`number`, 0, 1) 'restday'

i tried 

if (charindex(date_format(ts.`date`, '%w') <>  r.`number`, 0, 1)) 'restday'

but sends error message


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