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    Maybe you will ask three-tier access DB, ADO also support?!But the three best ways are stateless, in highly concurrent processing, General Data Set cached locally are not allowed.ADO is not a one-way data set attribute, all the data is downloaded to the local, constantly opened up or release memory, memory is a great test of the three-tier.TUni Query has a Uni Directional property supports one-way speed, and DBX to ideas. Uni DAC have some extraordinary methods or properties.

    However, we only want to update one record, since we only have one friend named Ross Eustace Geller.We simply need to separate the columns in the SET clause with a comma. Assuming the country and area codes are unchanged and the phone id is 9, our insert statement would be as follows: Got that? Create an insert statement to put a new record (with an address_id of 4) into the ADDRESS table.Let me demonstrate: This method works just as well for three, four or however many columns; do bear in mind, however, that SQL will use the same WHERE clause to identify the record(s) to update. I don’t know how well you remember our database structure, but to record this information we will need to add the new number to the PHONE_NUMBER table (this will call for an INSERT statement), and then add a record (another INSERT) to the FRIEND_PHONE linking this new number with Rachel. You’ll want to remember that you’ll need to enclose VARCHAR2 strings in single quotes.And now, just to keep you on your toes, I’m going to interrupt our conversation about insert statements to keep a promise I made you to tell you more about dates.(Don’t panic, we’ll return to inserts once this detour is over.) The problem with dates, if you recall, is how to use them in SQL; if you enclose them in single quotes they’ll be taken as VARCHAR2 strings and if you don’t they might be mistaken for numbers.

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