SELECT *
FROM dept
WHERE ASCIISTR (dname) LIKE '%\%' AND INSTR (dname, '\') <= 0;
Oracle® Database SQL Reference
10g Release 2 (10.2)中关于ASCIISTR函数的解释：
ASCIISTR takes as its argument a string, or an expression that resolves to a string, in any character set and returns an ASCII version of the string in the database character set. Non-ASCII characters are converted to the form. \xxxx, where xxxx represents a UTF-16 code unit.
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