How to query boolean use SQL？

mb.runSQLQuery(`

SELECT * FROM daily where index = true;

`).sort({date:-1})

.limit(100)

OR:

SELECT * FROM daily where index is true;

col 'index' is boolean，but when execute it , return messge:

{

"message" : "SyntaxError: Line: 1 Column: 32, Expected [A-Za-z0-9_:] or [A-Za-z0-9_] but ' ' found.",

"stack" : "script:2:4",

"sql" : "SELECT * FROM daily where index is TRUE )",

"___" : " ^ ",

"location" : {

"start" : {

"offset" : 31,

"line" : 1,

"column" : 32

},

"end" : {

"offset" : 32,

"line" : 1,

"column" : 33

}

}

}