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MySQL Articles
Page 199 of 355
Convert a stored MD5 string to a decimal value in MySQL?
You can use the conv() function along with the cast() to cast from hexadecimal to a decimal value.Note − MD5 is in hexadecimalLet us first create a table −mysql> create table DemoTable ( Password text ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values("a5391e96f8d48a62e8c85381df108e98"); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values("ea7a32d2dc5bb793af262dcb6ea1a54d"); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------------------------------+ | Password ...
Read MoreWhich is the fastest way to get a column's maximum value in MySQL?
You can try to get a column’s maximum value using two ways. The first way is as follows −select max(yourColumnName) from yourTableName;The second way is as follows −select yourColumnName from yourTableName order by yourColumnName DESC LIMIT 1;NOTE − The first query takes less time than the second query because the second query first sort n number of values then gives the highest value using LIMIT 1. Therefore, use the first query.Let us first create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command ...
Read MoreSelecting from a MySQL table based on parts of a timestamp?
Let us first create a table −mysql> create table DemoTable ( AdmissionDate timestamp ); Query OK, 0 rows affected (0.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2007-01-10'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('2015-07-12'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('2017-11-01'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('2019-08-29'); Query OK, 1 row affected (0.08 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+ | AdmissionDate ...
Read MoreMySQL query to fetch column length declared with BLOB type
For this, use the LENGTH() function from MySQL. Let us first create a table. We have declared the type of column as BLOB −mysql> create table DemoTable ( Title blob ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('This is a MySQL tutorial'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Java is an object oriented programming language'); Query OK, 1 row affected (0.61 sec) mysql> insert into DemoTable values('C is a procedural language'); Query OK, 1 row affected (0.20 sec)Display all records from ...
Read MoreHow to swap a specific field value in MySQL?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number1 int, Number2 int ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Number1, Number2) values(10, 30); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Number1, Number2) values(60, 50); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Number1, Number2) values(110, 100); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ...
Read MoreSearching 2 fields at the same time to fetch a specific First Name and Last Name from a table in MySQL
For this, you can use LIKE operator along with AND. Let us first create a table −mysql> create table DemoTable ( EmployeeFirstName varchar(50), EmployeeLastName varchar(50) ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 'Smith'); Query OK, 1 row affected (0.61 sec) mysql> insert into DemoTable values('David', 'Miller'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('John', 'Doe'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Adam', 'Smith'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Carol', ...
Read MoreCan we use "LIKE concat()" in a MySQL query?
Yes, we can do that. Let us first create a table −mysql> create table DemoTable ( Name varchar(50) ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ...
Read MoreMySQL query to select a random row value (Id and Name) having multiple occurrences (Name)?
For this, use RAND() for random records and LIMIT 1 to get only a single value. However, use the WHERE clause to select that particular ‘Name’, which is repeating.Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (1.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name) values('Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(Name) values('Bob'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name) values('David'); Query OK, 1 row affected ...
Read MoreUpdate only a single column in a MySQL table and increment on the basis of a condition
Let us first create a table −mysql> create table DemoTable ( Name varchar(50), Score int ); Query OK, 0 rows affected (1.02 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Sam', 45); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Mike', 28); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable values('Carol', 27); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('David', 67); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the ...
Read MoreMySQL time period query to fetch date records from interval of 14 weeks from current date?
For this, you can use the BETWEEN keyword. Let us first create a table −mysql> create table DemoTable ( ArrivalDate date ); Query OK, 0 rows affected (0.93 sec)Let’s say the current date is 2019-08-31.Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-04-21'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2019-03-01'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-09-01'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('2019-08-31'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-06-30'); Query OK, 1 ...
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