sqltypes

Bool returns NullBool.

Decimal returns a NullDecimal.

Int0 returns NullInt0.

IntM1 returns NullIntM1.

String returns NullString.

NullBool is a bool that can be NULL (from DB).

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NullFloat64 is a float64 with the 0 value being nil (on sending to sql).

NullInt0 is a normal int (0 = nil).

NullIntM1 is a normal int (-1 = nil).