Where
The WHERE clause consists of 1..n filters combined with AND and OR operators.
A filter consists of a filter type, an operator and 0..n filter values.
A filter value in MQL is an arbitrary sequence of characters bounded by single quotes ('). Integer values, Long values, Double values, date values, or keywords, such as ME, TODAY, and YESTERDAY etc. can be used as filter values without the single quotes.
To include a single-quote character within a filter value, write two adjacent single quotes.
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