BASIC SQL*PLUS :: DISTINCT

BASIC SQL*PLUS :: DISTINCT

এই টিউটোরিয়ালটি ডুপলিকেট রো কি ভাবে বাদ দেওয়া যায় তা শিখান হবে

বিস্তারিত ব্যাখা ::

ডেটাবেইজ টেবিলে থাকা রেকড গুলোর মধ্যে একই রেকড যদি বার বার আসে যেমন Employees table এ –ডির্পাটমেন্ট এর নাম বা জব টাইটেল এর নাম বার বার আসে যাকে আমরা ডুবলিকেট রো বলি এটি বাদ দিতে চাইলে আমরা DISTINCT ব্যবহার করতে পারি । DISTINCT ব্যবহারের মাধ্যমে আমরা ডুপলিকেট রো বাদ দিতে পারি

সিনটেক্স ::

এটি Duplicate row বাদ দেওয়ার সিনটেক্স distinct ::

SELECT DISTINCT COLUMN_NAME
FROM TABLE_NAME;

শুধুমাত্র কলাম এর আগে DISTINCT লেখা লিখে দিলে DUPLICATE রেকড বাদ যাবে

উদাহরণ

এটি DISTINCT ব্যবহারের উদাহরণ

SQL> SELECT DISTINCT JOB_ID
  2  FROM EMPLOYEES;

JOB_ID
----------
AC_ACCOUNT
AC_MGR
AD_ASST
AD_PRES
AD_VP
FI_ACCOUNT
FI_MGR
HR_REP
IT_PROG
MK_MAN
MK_REP

JOB_ID
----------
PR_REP
PU_CLERK
PU_MAN
SA_MAN
SA_REP
SH_CLERK
ST_CLERK
ST_MAN

19 rows selected.

SQL>

 

 

 

 

 

 

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