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Database Articles
Page 334 of 547
MySQL IF/WHEN/ELSE/OR with ORDER BY FIELD
Let us first create a table −mysql> create table DemoTable1884 ( Marks int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1884 values(55); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1884 values(97); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1884 values(79); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1884 values(87); Query OK, 1 row affected (0.00 sec)Display some records in the table using insert command −mysql> select * from DemoTable1884;This will produce the following output −+-------+ | ...
Read MoreCan we use a comma between MySQL SELECT statements?
Yes, we can do that. The syntaxes are as follows −Syntax1: select * from yourTableName1, yourTableName2; Syntax2: select * from yourTableName1 cross join yourTableName2;Both the above syntaxes give the same result.Let us first create a table −mysql> create table DemoTable1882 ( Id int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1882 values(10); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1882 values(20); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1882 values(30); Query OK, 1 row affected (0.00 sec)Display all records ...
Read MoreHow to copy rows from one table to another in MySQL?
For this, use INSERT INTO SELECT statement. Let us first create a table −mysql> create table DemoTable1879 ( Id int, Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1879 values(101, 'Chris Brown'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1879 values(102, 'David Miller'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1879 values(103, 'Adam Smith'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1879;This will produce the ...
Read MoreHow to select a date less than the current date with MySQL?
Let us first create a table −mysql> create table DemoTable1877 ( DueDate datetime ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1877 values('2019-12-10'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1877 values('2019-12-05'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1877 values('2019-12-07'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1877 values('2019-12-09'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1877;This will ...
Read MoreInsert Euro and Dollar symbol to a column in MySQL?
For this, use CASE statement with UPDATE command. Let us first create a table −mysql> create table DemoTable1874 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Amount varchar(100) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1874(Amount) values('3450'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1874(Amount) values('190'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1874(Amount) values('7600'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1874(Amount) values('4500'); Query OK, 1 row affected (0.00 sec)Display all records ...
Read MoreBest way to update a single column in a MySQL table?
To update a single column, use UPDATE and SET as in the below syntax −update yourTableName set yourColumnName=yourValue;Let us first create a table −mysql> create table DemoTable1873 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1873(FirstName) values('John'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1873(FirstName) values('Adam'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1873(FirstName) values('David'); Query OK, 1 row affected (0.00 sec) mysql> insert into ...
Read MoreMySQL query to SELECT rows with LIKE and create new column containing the matched string?
For this, use SUBSTRING(). Let us first create a table −mysql> create table DemoTable1872 ( Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1872 values('John Doe'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1872 values('Adam Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1872 values('Mitchell Johnson'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1872;This will produce the following output −+------------------+ | Name ...
Read MoreMySQL Datetime to add days?
Let us first create a table −mysql> create table DemoTable1871 ( ArrivalDate datetime ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1871 values('2019-12-19 7:45:00'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1871 values('2018-11-10 12:00:00'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1871 values('2019-01-31'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1871; This will produce the following output −+---------------------+ | ArrivalDate | ...
Read MoreGet first date from timestamp in MySQL group by another column with duplicate value
For this, you can use aggregate function MIN() and GROUP BY. Let us first create a table −mysql> create table DemoTable1870 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value int, ShippingTimestamp varchar(100) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1870(Value, ShippingTimestamp) values(10, '1570645800'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1870(Value, ShippingTimestamp) values(10, '1546194600'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1870(Value, ShippingTimestamp) values(11, '1573324200'); Query OK, 1 row affected (0.00 ...
Read MoreConcatenate two values from the same column with different conditions in MySQL
For this, you can use group_concat() with aggregate function. Let us first create a table −mysql> create table DemoTable1869 ( Id int, Subject varchar(20 ), Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1869 values(100, 'MySQL', 'John'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1869 values(100, 'MongoDB', 'Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1869 values(101, 'MySQL', 'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1869 values(101, ...
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