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MySQL Articles
Page 47 of 355
How to concatenate MySQL distinct query results into a string?
Use group_concat() function from MySQL to concatenate. Let us first create a table −mysql> create table DemoTable -> ( -> Subject varchar(10) -> ); Query OK, 0 rows affected (0.43 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('C'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('C++'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('C++'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable values('MongoDB'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('MySQL'); Query ...
Read MoreGet only digits using regexp in MySQL?
If you want to get only digits using REGEXP, use the following regular expression( ^[0-9]*$) in where clause.Case 1 − If you want only those rows which have exactly 10 digits and all must be only digit, use the below regular expression.SELECT *FROM yourTableName WHERE yourColumnName REGEXP '^[0-9]{10}$';Case 2 − If you want only those rows with the digit either 1 or more, the following is the syntax −SELECT *FROM yourTableName WHERE yourColumnName REGEXP '^[0-9]*$';The above syntax will give only those rows that do not have any any characters.To understand the above syntax, let us create a table. The query ...
Read MoreFetch rows where first character is not alphanumeric in MySQL?
To fetch rows where first character is not alphanumeric, you can use the following regular expression.Case 1 − If you want those rows that starts from a digit, you can use the following syntax −SELECT *FROM yourTableName WHERE yourColumnName REGEXP '^[0-9]';Case 2 − If you want those rows that start from an alphanumeric, use the following syntax −SELECT *FROM yourTableName WHERE yourColumnName REGEXP '^[^0-9A-Za-z]' ;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table getRowsFirstNotAlphanumeric -> ( -> Id int NOT NULL AUTO_INCREMENT, -> UserPassword varchar(20), -> PRIMARY ...
Read MoreHow to update data in a MySQL database without removing the old data?
For this, you can use UPDATE and concatenate the new data with the old one to save the old data as well −update yourTableName set yourColumnName=concat(yourColumnName, ", yourValue");Let us first create a table −mysql> create table DemoTable -> ( -> CustomerName varchar(100) -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Sam'); Query OK, 1 row affected (0.14 sec)Display all records from ...
Read MoreGet part of a string based on a character in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Code varchar(100) -> ); Query OK, 0 rows affected (1.07 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('/101/102/106'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('/110/111/101'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('/111/114/201'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values('/111/118'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce ...
Read MoreHow to open MySQL command line on Windows10?
To open the MySQL command line from cmd, you need to use username root with your password.Follow the below given steps. The syntax is as follows −cd \> press enter key cd Program Files\MySQL\MySQL Server 8.0\bin> press enter key C:\Program Files\MySQL\MySQL Server 8.0\bin>mysql -uroot -p press enter key Enter password: ******Here is the step by step instruction to open MySQL command line. First, Go to START > RUN or Open Run using Windows+R command −Type CMD and hit OK button −After pressing OK button, the CMD will open −Now you need to follow the above instruction. First reach your bin ...
Read MoreMySQL query to return the entire date and time based on a string and format
Let us first create a table −mysql> create table DemoTable -> ( -> AdmissionDate varchar(100) -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Wed, 19 Jun 2019 04:10:20'); Query OK, 1 row affected (0.22 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+---------------------------+ | AdmissionDate | +---------------------------+ | Wed, 19 Jun 2019 04:10:20 | +---------------------------+ 1 row in set (0.00 sec)Following is ...
Read MoreCreate a table named "select" in SQL databases?
Since “select” is a reserved word in MySQL, we cannot create a table name with it. But, if you still want to create such a table, surround the word select with quote.Let us first create a table −mysql> create table `select` -> ( -> Number int -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command −mysql> insert into `select` values(10); Query OK, 1 row affected (0.16 sec) mysql> insert into `select` values(20); Query OK, 1 row affected (0.11 sec) mysql> insert into `select` values(30); Query OK, 1 row affected (0.12 ...
Read MoreHow do you append a carriage return to a value in MySQL?
You need to use CONCAT_WS() function from MySQL to append a carriage return. If you are looking for a new line, then append in the beginning. The syntax is as follows −SELECT CONCAT_WS(‘’, yourColumnName) as anyVariableName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table NewLineDemo -> ( -> CountryName varchar(10) -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into NewLineDemo values('US'); Query OK, 1 row affected (0.15 sec) ...
Read MoreHow to add subtotal to a table column displaying NULL in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Amount int, -> SubTotal int -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −ysql> insert into DemoTable(Amount) values(50); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Amount) values(60); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Amount) values(70); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Amount) values(80); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce ...
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