INSERT Statement Limitations
Inserted data is truncated on the right without warning if it is too long to fit into the column.
Attempting to insert a value that is out of the range of a column's data type causes a NULL to be inserted into the column.
When a dBASE, Microsoft Excel, Paradox, or Text driver is used, inserting a zero-length string into a column actually inserts a NULL instead.
When the Microsoft Excel driver is used, if an empty string is inserted into a column, the empty string is converted to a NULL; a searched SELECT statement that is executed with an empty string in the WHERE clause will not succeed on that column.
A table is not updatable by the Paradox driver under two conditions:
When a unique index is not defined on the table. This is not true for an empty table, which can be updated with a single row even if a unique index is not defined on the table. If a single row is inserted in an empty table that does not have a unique index, an application cannot create a unique index or insert additional data after the single row has been inserted.
If the Borland Database Engine is not implemented, only read and append statements are allowed on the Paradox table.
When the Text driver is used, NULL values are represented by a blank-padded string in fixed-length files, but are represented by no spaces in delimited files. For example, in the following row containing three fields, the second field is a NULL value:
"Smith:,, 123
When the Text driver is used, all column values can be padded with leading spaces. The length of any row must be less than or equal to 65,543 bytes.
