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MySQLi Articles
Page 98 of 341
UPDATE with logical AND operator in MySQL
For this, you can use AND operator with WHERE clause. Let us first create a table −mysql> create table DemoTable1616 -> ( -> StudentId int, -> StudentName varchar(20), -> StudentMarks int -> ); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1616 values(101, 'Chris', 56); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1616 values(102, 'Bob', 87); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1616 values(103, 'David', 56); Query OK, 1 row affected (0.20 sec) ...
Read MoreHow to get the count of both present and absent students for a year in MySQL?
For this, you can use IF() along with aggregate function SUM(). Let us first create a table −mysql> create table DemoTable1617 -> ( -> Attendance varchar(20), -> CurrentYear int -> ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1617 values('Present', 2019); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1617 values('Absent', 2019); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1617 values('Absent', 2017); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1617 values('Present', 2019); Query ...
Read MoreSelect total from a MySQL table based on month
For this, you can use GROUP BY MONTH(). Let us first create a table −mysql> create table DemoTable1628 -> ( -> PurchaseDate date, -> Amount int -> ); Query OK, 0 rows affected (1.55 sec)Insert some records in the table using insert command.mysql> insert into DemoTable1628 values('2019-01-10', 1500); Query OK, 1 row affected (0.68 sec) mysql> insert into DemoTable1628 values('2019-10-10', 2000); Query OK, 1 row affected (0.61 sec) mysql> insert into DemoTable1628 values('2019-10-24', 100); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1628 values('2019-11-10', 500); Query OK, 1 row affected ...
Read MoreWhat happens to the current MySQL transaction if the session is killed by DBA?
Suppose if a session is killed in the middle of a transaction then that current MySQL transaction will be rolled back by MySQL and ended. It means that all the database changes made in the current transaction will be removed. It is called n implicit rollback when the session is killed.ExampleSuppose we have the following values in the table ‘marks’mysql> Select * from marks; +------+---------+-----------+-------+ | Id | Name | Subject | Marks | +------+---------+-----------+-------+ | 1 | Aarav | Maths | 50 | | 1 | Harshit | Maths ...
Read MoreWhat are some frequently used mysqlimport options while uploading the data into MySQL table through command line?
mysqlimport can be run with a number of options. Followings are some options for mysqlimport and their effect on import.OptionAction-r or –replaceCause imported rows to overwrite existing rows if they have the same unique key value.-i or –ignoreIgnore rows that have the same unique key value as existing rows.-f or –forceForce mysqlimport to continue inserting data even if errors are encountered.-l or --lock-tablesLock each table before importing (a good option on a busy server).-d or –deleteEmpty the table before inserting.--fields-terminated- by='char'Specify the separator used between values of the same row, default \t (tab).--fields-enclosed- by='char'Specify the delimiter that encloses each field; ...
Read MoreMySQL Order by a specific column x and display remaining values in ascending order
Let us first create a table −mysql> create table DemoTable -> ( -> MonthNumber int -> ); Query OK, 0 rows affected (1.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(9); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(6); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(8); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(5); ...
Read MoreDelete a specific record from a MySQL table by using AND in WHERE clause
MySQL AND is used in WHERE to fetch a record by filtering using multiple conditions. Let us first create a table−mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.51 sec) mysql> insert into DemoTable values(103, 'Bob'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement ...
Read MoreSort records with special characters like '2321/78/54-6'
To sort, use ORDER BY SUBSTRING(). Let us first create a table −mysql> create table DemoTable -> ( -> Value varchar(40) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2321/78/54-6') -> ; Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2321/78/54-8'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('2321/78/54-5'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2321/78/54-9'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement ...
Read MoreOrder VARCHAR records with string and numbers in MySQL
For this, use ORDER BY clause. Let us first create a table −mysql> create table DemoTable -> ( -> StudentCode varchar(20) -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('101J'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('100A'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('100B'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('101S'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('103M'); Query OK, 1 row affected (0.15 ...
Read MoreGet number of users of different type in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> UserName varchar(20), -> UserType ENUM('New User', 'Registered User') -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 'New User'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('David', 'New User'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Mike', 'Registered User'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Sam', 'New User'); Query OK, 1 row affected (0.10 sec)Display all records ...
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