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select trunc(5.75),trunc(5.75,1),trunc(5.75,-1),trunc(556.234,-2) from dual;
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TRUNC(5.75) TRUNC(5.75,1) TRUNC(5.75,-1) TRUNC(556.234,-2)
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SQL> select trunc(sysdate,'yyyy'), round(sysdate,'yyyy') from dual;
TRUNC(SYSDATE, ROUND(SYSDATE,
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SQL> select ascii(A) A,ascii(a) a,ascii(0) zero,ascii( ) space from dual;
A A ZERO SPACE
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SQL> select chr(54740) zhao,chr(65) chr65 from dual;
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