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bool supportsSavepoints() Determine if the grammar supports savepoints

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mixed sum(string $column) Retrieve the sum of the values of a given column

$this addSelect(array|mixed $column) Add a new select column to the query

string __toString() Get the value of the expression.

string implode(string $column, string $glue = '') Concatenate values of

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array wrapArray(array $values) Wrap an array of values.

mixed getValue() Get the value of the expression.