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SQL Fundamentals || Oracle SQL语言 DUAL is a public table that you can use to view results from functions and calculations. The DUAL table is owned by t 阅读全文
posted @ 2017-07-03 20:21
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posted @ 2017-07-03 20:02
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posted @ 2017-07-03 19:59
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posted @ 2017-07-03 19:57
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Description The Oracle/PLSQL NVL function lets you substitute a value when a null value is encountered. NVL函数是当出现空值时替换一个值 Syntax NVL( string1, replace 阅读全文
posted @ 2017-07-03 11:10
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