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並前往https://books.google.com.tw/books?id=HkC3BwAAQBAJ&pg=PT250&lpg=PT250&dq=mysql+ifnull&source=bl&ots=6D3e1T2ZRD&sig=ACfU3U0icoIhcATq4Ltl0FujSlxhBPkl0w&hl=zh-TW&sa=X&ved=2ahUKEwj52Yal0rf0AhVT7rsIHQsaD44Q6AF6BQirAhAD

Learning MySQL and MariaDB: Heading in the Right Direction ...

Here's the same example again, but with the IFNULL() function: mysql -p --skip-column-names -e \ "SELECT CONCAT_WS('|', IFNULL(formal_title, ...

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