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MySQLi Articles
Page 199 of 341
MySQL query to group concat distinct by Id?
Let us first create a table −mysql> create table DemoTable ( Id int, Name varchar(100) ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.44 sec) mysql> insert into DemoTable values(200, 'Robert'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(300, 'David'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(400, 'Mike'); Query OK, 1 row affected (0.10 sec) mysql> insert ...
Read MoreMySQL query to replace backslash from a varchar column with preceding backslash string values
Let us first create a table −mysql> create table DemoTable ( Title varchar(100) ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('"MySQL'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('MongoDB"'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('"Java"'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('"C"'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-----------+ | Title ...
Read MoreIs it necessary to add DEFAULT NULL in MySQL?
No, it isn’t necessary because without adding DEFAULT NULL, it gives NULL value. For example, let’s say you haven’t added DEFAULT NULL and inserted a record with no value, then the result would display the NULL value as the inserted value.Let us first create a table −mysql> create table DemoTable ( FirstName varchar(100) ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(); Query ...
Read MoreMySQL query to remove everything except the last 7 characters in column record
Let us first create a table −mysql> create table DemoTable ( Strength text ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John is a good programmer'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('Chris is a good player in cricket'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Bob is good in algorithm'); Query OK, 1 row affected (0.42 sec)Display all records from the table using select statement −mysql> select *from DemoTableThis will produce the following output −+-----------------------------------+ | Strength ...
Read MoreHow can I achieve similar result like using a loop in MySQL WHERE clause to display only alternate ID records?
Get similar results using MySQL IN(). Let us first create a table −mysql> create table DemoTable ( ClientId int, ClientName varchar(100), ClientAge int ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris', 34); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(101, 'Robert', 31); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(103, 'David', 33); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(104, 'Mike', 45); Query OK, 1 row affected (0.17 sec) mysql> insert ...
Read MoreMySQL query to order by current day and month?
For this, you can use the ORDER BY CASE statement. Let us first create a table −mysql> create table DemoTable ( DueDate date ); Query OK, 0 rows affected (0.56 sec)Note − Let’s say the current date is 2019-07-22.Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-03-10'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-08-25'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-06-01'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('2019-12-31'); Query OK, 1 row affected (0.17 sec)Display all records from the ...
Read MoreFix a row value and then ORDER BY DESC rest of the values in MySQL
Let us first create a table −mysql> create table DemoTable ( id int ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.43 sec) mysql> insert into DemoTable values(7); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(8); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(6); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(9); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(11); Query OK, 1 row affected ...
Read MoreHow to remove unconvertable characters to ASCII with SELECT in MySQL?
Let us first create a table −mysql> create table DemoTable ( Value varchar(100) ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('€986'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('§97'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------+ | Value | +--------+ | €986 | | §97 +--------+ 2 rows in set (0.00 sec)Following is the query to remove unconvertable characters to ASCII ...
Read MoreWrite a single MySQL query to return the ID from the corresponding row which is a NOT NULL value
Let us first create a table −mysql> create table DemoTable ( StudentId int, StudentName varchar(100) ); Query OK, 0 rows affected (0.85 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(NULL, 'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(NULL, 'Robert'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(101, 'David'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(102, 'Mike'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(103, 'Sam'); Query OK, 1 row affected (0.18 sec)Display all records ...
Read MoreGet the minimum and maximum value from a VARCHAR column and display the result in separate MySQL columns?
Let us first create a table −mysql> create table DemoTable ( Value varchar(100) ); Query OK, 0 rows affected (0.75 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('190'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('230'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('120'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('189'); 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 −+-------+ | Value | +-------+ ...
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