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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 More
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 More
For random records, you can use rand() method. To set the number of records, use the LIMIT −select *from yourTableName order by rand() limit numberOfRecords;Let us first create a table −mysql> create table DemoTable -> ( -> LastName varchar(100) -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Brown'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Smith'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Taylor'); Query OK, 1 row affected (0.10 sec) mysql> insert ... Read More
For this, use SELECT CASE. Let us first create a table −mysql> create table DemoTable -> ( -> Num1 int, -> Num2 int -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 30); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------+------+ | Num1 | Num2 | +------+------+ | 10 | 30 | +------+------+ 1 row in set (0.00 sec)Following is the query to store ... Read More
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 More
Yes, you can use LEAST() function from MySQL −select least(yourColumnName1, yourColumnName2, ...N) from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Date1 date, -> Date2 date, -> Date3 date -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-03-31', '2019-01-01', '2019-03-05'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------+------------+------------+ | Date1 | Date2 | ... Read More
For this, you can use UNIQUE INDEX −alter table yourTableName ADD UNIQUE INDEX(yourColumnName1, yourColumnName2, ....N);Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (0.55 sec)Following is the query to add unique index −mysql> alter table DemoTable ADD UNIQUE INDEX(Value1, Value2); Query OK, 0 rows affected (0.54 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −Note − Use the INSERT IGNORE command rather than the INSERT command. If a record doesn't duplicate an existing ... Read More
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 More
Use the STR_TO_DATE() method for this. Let us first create a table −mysql> create table DemoTable -> ( -> DueDatetime varchar(100) -> ); Query OK, 0 rows affected (1.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('22-06-2019 14:40'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('02-07-2015 13:10'); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------------+ | DueDatetime | +------------------+ | 22-06-2019 14:40 | | 02-07-2015 13:10 | ... Read More
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 ... Read More