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Database Articles
Page 350 of 547
MySQL search and replace record from a list of records
Let us first create a table −mysql> create table DemoTable -> ( -> ListOfName text -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Carol, Sam, John, David, Bob, Mike, Robert, John, Chris, James, Jace'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------------------------------------------------------------+ | ListOfName ...
Read MoreHow to extract date from string in MySQL?
To extract date from the string in MySQL, use SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John has got joining date.12/31/2018'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Carol has got joining date.01/11/2019'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Sam will arrive at.12/03/2050'); Query OK, 1 row affected (0.87 sec)Display all records from the table using select statement ...
Read MoreMySQL query to find the number of occurrences from two columns?
Use MySQL GROUP_BY to find the number of occurrences from two columns. Let us first create a table −mysql> create table DemoTable -> ( -> Name1 varchar(20), -> Name2 varchar(20) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 'Adam'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris', 'David'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Robert', 'Mike'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('David', 'Chris'); Query OK, 1 row ...
Read MoreFind the difference between dates in the form of months with MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Date1 date, -> Date2 date -> ); Query OK, 0 rows affected (1.04 sec)Insert some records in the table using insert command &miuns;mysql> insert into DemoTable values('2017-01-10', '2017-12-10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2018-12-31', '2015-01-02'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2020-03-01', '2019-06-15'); 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 following output −+------------+------------+ | Date1 ...
Read MoreHow to use ORDER BY field and sort by id in a single MySQL field?
For this, you can use ORDER BY FIELD. Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.78 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable values(201, 'Mike'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(110, 'Adam'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable values(250, 'John'); Query OK, 1 row affected (0.33 sec)Display all ...
Read MoreSelect distinct values from three columns and display in a single column with MySQL
For this, use UNION more than once in a single MySQL query. Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int, -> Value3 int -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20, null, null); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(20, null, null); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(20, null, null); Query OK, 1 row affected (0.12 sec) mysql> insert into ...
Read MoreImplement MySQL CASE statement with WHEN clause
CASE statement with the WHEN clause is used to work around conditions. Following is the syntax−select *, case when yourCondition then yourStatement when yourCondition then yourStatement . . else yourStatement from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> StudentName varchar(20), -> StudentMarks int -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 78); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Robert', 88); Query OK, 1 row affected (0.14 sec) ...
Read MoreWhich technique is more efficient for replacing duplicate records in MySQL?
To replace duplicate records and avoid any error while inserting, use INSERT ON DUPLICATE KEY UPDATE. Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20), -> UNIQUE(Id, Name) -> ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris') on duplicate key update Id=10001, Name='Robert'; Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(102, 'Mike') on duplicate key update Id=10001, Name='Robert'; Query OK, 1 row affected (0.17 sec) mysql> insert into ...
Read MoreIn MySQL, is there a way to turn column records into a list?
Yes, we can turn a column records into a list using the MySQL GROUP_CONCAT(). Let us first create a table −mysql> create table DemoTable -> ( -> ClientId int, -> ClientName varchar(20) -> ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.54 sec) mysql> insert into DemoTable values(100, 'Robert'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(100, 'Adam'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(100, 'David'); Query OK, ...
Read MoreCreate a temporary table with dates in MySQL
To create a temporary table with dates, use the CREATE TEMPORARY TABLE in MySQL. Following is the syntax −Syntaxcreate temporary table yourTableName( yourColumnName datetime );Let us first create a table −mysql> create temporary table DemoTable -> ( -> DueDate datetime -> ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(now()); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable values(curdate()); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable values('2018-01-21'); Query OK, 1 row affected (0.00 sec) mysql> insert into ...
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