06 SQL SQL

6. SQL

SQL

SQL SQL (aggregation) SQL : :

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SQL

6. SQL

SQL

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SQL

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SQL

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INITCAT INITCAP

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LOWER, UPPER LOWER, UPPER LOWER : UPPER :

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LOWER, UPPER

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LENGTH ,LENGTHB .

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LENGTH, LENGTHB

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SUBSTR SUBSTR

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SUBSTR

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INSTR INSTR

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INSTR

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LPAD, RPAD LPAD, RPAD LPAD RPAD

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LPAD, RPAD

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LTRIM, RTRIM LTRIM, RTRIM LTRIM RTRIM

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LTRIM, RTRIM

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SQL

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ROUND ROUND

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ROUND

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TRUNC TRUNC

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TRUNC JDBC

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MOD MOD MOD

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MOD

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CEIL, FLOOR CEIL, FLOOR CEIL

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CEIL, FLOOR

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,

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SQL

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SQL

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SYSDATE SYSDATE SYSDATE ,

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MONTHS_BETWEEN, ADD_MONTHSMONTHS_BETWEEN, ADD_MONTHSMONTHS_BETWEEN ADD_MONTHS

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MONTHS_BETWEEN, ADD_MONTHS JDBC

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LAST_DAY, NEXT_DAYLAST_DAY, NEXT_DAYLAST_DAY NEXT_DAY oracle day ,,,,,, . oracle day MON, TUE, WED, THU, FRI, SAT, SUN .

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LAST_DAY, NEXT_DAY

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ROUND, TRUNC ROUND, TRUNC

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ROUND, TRUNC 1

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ROUND, TRUNC 2

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TO_CHARTO_CHAR TO_CHAR

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TO_CHAR 1

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TO_CHAR 2 oracle Month 4, 5 .

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1

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TO_NUMBER TO_NUMBER TO_NUMBER

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TO_NUMBER

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TO_DATE TO_DATE TO_DATE oracle TO_DATE(6 01, 01, MONTH DD. YY)JDBC

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SQL

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JDBC

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() (deptno) 101 ( 4 15 2006) 36 (sal) ( 1 ) java .

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NVL NVL : NVLNVL NULL 0

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NVL

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NVL : NVL2 NVL2 NVL2 NULL , NULL

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NVL : NVL2 JDBC

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NVL : NULLIF NULLIF NULLIF NULL ,

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NVL : NULLIF

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NVL : COALESCE COALESCE COALESCE NULL

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NVL : COALESCE

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DECODE DECODE DECODE IF CASE SQL DECODE =

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DECODE DECODE .

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DECODE

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CASE CASE CASE DECODE DECODE = , CASE , , WHEN

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CASE CASE .

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SQL

CASE

6. SQL