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MySQL Articles
Page 35 of 355
Multiple LIKE Operators with ORDER BY in MySQL?
Following is the syntax implementing multiple LIKE operators with ORDER BY −select *from yourTableName order by ( yourColumnName like '%yourValue1%' ) + ( yourColumnName like '%yourValue2%' ) + . . N desc;Let us create a table −mysql> create table demo2 −> ( −> id int not null auto_increment, −> name varchar(100), −> primary key(id) −> ); Query OK, 0 rows affected (1.53 sec)Insert some records into the table with the help of insert command −mysql> insert into demo2(name) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into demo2(name) values('David'); Query OK, 1 row affected (0.09 ...
Read MoreHow to get number located at 2 places before decimal point MySQL?
In order to get number located at 2 places before decimal point, you can use the concept of div.Let us create a table −mysql> create table demo1 −> ( −> value float −> ); Query OK, 0 rows affected (2.20 sec)Insert some records into the table with the help of insert command −mysql> insert into demo1 values(456.54); Query OK, 1 row affected (0.16 sec) mysql> insert into demo1 values(50.64); Query OK, 1 row affected (0.17 sec) mysql> insert into demo1 values(1000.78); Query OK, 1 row affected (0.13 sec)Display records from the table using select statement −mysql> select *from demo1;This will ...
Read MoreHow to select subsets of data In SQL Query Style in Pandas?
IntroductionIn this post, I will show you how to perform Data Analysis with SQL style filtering with Pandas. Most of the corporate company’s data are stored in databases that require SQL to retrieve and manipulate it. For instance, there are companies like Oracle, IBM, Microsoft having their own databases with their own SQL implementations.Data scientists have to deal with SQL at some stage of their career as the data is not always stored in CSV files. I personally prefer to use Oracle, as the majority of my company’s data is stored in Oracle.Scenario – 1 Suppose we are given a ...
Read MoreSum of the first and last digit of a number in PL/SQL
In this problem, we are given a number n. Our task is to create a program to find the sum of the first and last digit of a number in PL/SQL.First, let’s brush-up about PL/SQL, PL/SQL is a combination of SQL along with the procedural features of programming languages.Let’s take an example to understand the problem, Input − n = 31415Output − 8Explanation − first digit = 3 , last digit = 5. Sum = 8To, solve this problem, we will extract the first and last digit to number n. And the print their sum.The first and last digits are ...
Read MoreCan I query how much disk space certain rows or columns are taking up in MySQL?
Yes, using the below syntax −select * from information_schema.tables where table_name=yourTableName;Let us first create a table −mysql> create table DemoTable1600 -> ( -> StudentId int, -> StudentFirstName varchar(20) -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1600 values(100, 'Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1600 values(101, 'David'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1600 values(102, 'Carol'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select * from ...
Read MoreHow to combine duplicate values into one with corresponding value separated by hyphens in MySQL?
To combine, use GROUP_CONCAT() function to combine some attributes in two rows into one. As a separator, use hyphens.Let us first create a table −mysql> create table DemoTable1386 -> ( -> Title varchar(255), -> Name varchar(60) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1386 values('Introduction to MySQL', 'Paul DuBois'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1386 values('Java in Depth', 'Khalid Mughal'); Query OK, 1 row affected (0.48 sec) mysql> insert into DemoTable1386 values('Introduction to MySQL', 'Russell Dyer'); Query OK, ...
Read MoreImplement numbering in MySQL GROUP_CONCAT
Let us first create a table −mysql> create table DemoTable1627 -> ( -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command.mysql> insert into DemoTable1627 values('John', 'Smith'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1627 values('John', 'Doe'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1627 values('Adam', 'Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1627 values('Carol', 'Taylor'); Query OK, 1 row affected (0.08 sec)Display all records from the table using ...
Read MoreHow to find all tables that contains columnA and columnB in MySQL?
To find specific column names, use information_schema.columns Here, I am using Id in place of columnA and Name in place of columnB −mysql> select table_name as TableNameFromWebDatabase -> from information_schema.columns -> where column_name IN ('Id', 'Name') -> group by table_name -> having count(*) = 3;This will produce the following output. Following are the table with columns Id and Name −+--------------------------+ | TableNameFromWebDatabase | +--------------------------+ | student | | distinctdemo | | secondtable | | groupconcatenatedemo ...
Read MoreMySQL query to count the dates and fetch repeated dates as well
To display the count, use aggregate function COUNT(*). Let us first create a table −mysql> create table DemoTable1321 -> ( -> ArrivalDatetime timestamp -> ); Query OK, 0 rows affected (0.50 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable1321 values(now()); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1321 values('2019-01-10 12:34:00'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1321 values('2019-06-12 11:34:00'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1321 values('2019-06-12 04:50:00'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1321 values('2019-09-18 10:50:45'); Query OK, 1 ...
Read MoreHow to search dob in a table, which is in the yyyy-mm-dd structure and compare only with a specific yyyy format (year) in MySQL?
For this, use MySQL YEAR() as in the below syntax −select * from yourTableName where year(yourColumnName)=’yourYearValue’;Let us first create a table −mysql> create table DemoTable1322 -> ( -> DOB date -> ); Query OK, 0 rows affected (0.55 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable1322 values('1999-04-12'); Query OK, 1 row affected (0.68 sec) mysql> insert into DemoTable1322 values('2010-12-01'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1322 values('2015-03-09'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable1322 values('2007-05-24'); Query OK, 1 row affected (0.08 sec)Display all records from the table ...
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