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Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as
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SELECT CAST('abc' AS varchar(5)) COLLATE French_CS_AS. Truncating and rounding results. When converting character or binary expressions (binary, char, nchar, nvarchar, varbinary, or varchar) to an expression of a different data type, the conversion operation could truncate the output data...
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field.
In general, R supports: NULL NA NaN Inf / -Inf NULL is an object and is returned when an expression or function results in an undefined value.
In computer programming, a null-terminated string is a character string stored as an array containing the characters and terminated with a null character ('\0', called NUL in ASCII). Alternative names are C string, which refers to the C programming language and ASCIIZ...
Because of the set null on delete, when a record in the supplier table is deleted, all corresponding records in the products table will have the supplier_id values