সিনট্যাক্স
একটি কলামের সব রোয়ের মোট ক্যারেক্টার সংখ্যা বের করতে CHAR_LENGTH() এবং SUM() ফাংশন কম্বাইন করুন।
SELECT SUM(CHAR_LENGTH(yourColumnName)) AS anyAliasName FROM yourTableName;
উদাহরণ
টেবিল তৈরি
mysql> create table CountAllCharactersDemo (
-> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> UserName varchar(20),
-> UserSubject text
-> );
Query OK, 0 rows affected (0.47 sec)
ডেটা ইনসার্ট
mysql> insert into CountAllCharactersDemo(UserName,UserSubject) values('Larry','Introduction To Java');
Query OK, 1 row affected (0.19 sec)
mysql> insert into CountAllCharactersDemo(UserName,UserSubject) values('Mike','Introduction To Computer Networks');
Query OK, 1 row affected (0.21 sec)
mysql> insert into CountAllCharactersDemo(UserName,UserSubject) values('Sam','Introduction To C');
Query OK, 1 row affected (0.18 sec)
mysql> insert into CountAllCharactersDemo(UserName,UserSubject) values('Carol','Introduction To Python');
Query OK, 1 row affected (0.25 sec)
mysql> insert into CountAllCharactersDemo(UserName,UserSubject) values('David','Introduction To Spring And Hibernate Framework');
Query OK, 1 row affected (0.15 sec)
সকল রেকর্ড দেখুন
mysql> select * from CountAllCharactersDemo;
আউটপুট
+--------+----------+------------------------------------------------+ | UserId | UserName | UserSubject | +--------+----------+------------------------------------------------+ | 1 | Larry | Introduction To Java | | 2 | Mike | Introduction To Computer Networks | | 3 | Sam | Introduction To C | | 4 | Carol | Introduction To Python | | 5 | David | Introduction To Spring And Hibernate Framework | +--------+----------+------------------------------------------------+
Case 1: মোট ক্যারেক্টার কাউন্ট
mysql> select SUM(CHAR_LENGTH(UserSubject)) AS AllCharactersLength from CountAllCharactersDemo;
আউটপুট
+---------------------+ | AllCharactersLength | +---------------------+ | 138 | +---------------------+
Case 2: প্রতিটি রোয়ের দৈর্ঘ্য
mysql> select UserId, UserName, UserSubject, CHAR_LENGTH(UserSubject) AS Length from CountAllCharactersDemo;
আউটপুট
+--------+----------+------------------------------------------------+--------+ | UserId | UserName | UserSubject | Length | +--------+----------+------------------------------------------------+--------+ | 1 | Larry | Introduction To Java | 20 | | 2 | Mike | Introduction To Computer Networks | 33 | | 3 | Sam | Introduction To C | 17 | | 4 | Carol | Introduction To Python | 22 | | 5 | David | Introduction To Spring And Hibernate Framework | 46 | +--------+----------+------------------------------------------------+--------+
নোট: CHAR_LENGTH() ক্যারেক্টার কাউন্ট করে (মাল্টিবাইট সাপোর্ট করে), LENGTH() বাইট কাউন্ট করে। UTF-8-এ দুটি ভিন্ন ফলাফল দিতে পারে।
