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To get the count of distinct records, use DISTINCT along with COUNT(). Following is the syntax −select count(DISTINCT yourColumnName) from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20), -> Score int -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', 56); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Sam', 89); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('John', 56); Query OK, 1 row affected (0.17 sec) mysql> insert into ... Read More
For this, you can use TIME_TO_SEC() function. Let us first create a table −mysql> create table DemoTable -> ( -> SourceTime time, -> DestinationTime time -> ); Query OK, 0 rows affected (1.33 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10:20:00', '4:50:54'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('12:05:10', '7:45:12'); Query OK, 1 row affected (0.30 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------+-----------------+ | SourceTime | DestinationTime | +------------+-----------------+ | 10:20:00 ... Read More
To filter, you can use STR_TO_DATE() function from MySQL. With that, use MONTH() to get the date from the specific month. Let us first create a table −mysql> create table DemoTable -> ( -> DueDate varchar(100) -> ); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('06-19-2019'); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable values('01-31-2018'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable values('12-01-2016'); Query OK, 1 row affected (0.14 sec)Display all records from the table using ... Read More
To sort an alphanumeric column, use LIKE operator along with SUBSTRING(). Let us first create a table −mysql> create table DemoTable -> ( -> StudentId varchar(100) -> ); Query OK, 0 rows affected (1.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('S/TU/100'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values('S/TU/1000'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('S/TU/10'); Query OK, 1 row affected (0.47 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following ... Read More
For this, you can COUNT() method, which does not include NULL value. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100), -> CountryName varchar(100) -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John', null); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Chris', 'US'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Robert', null); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Bob', 'UK'); Query ... Read More
The LIMIT tells about how many records you want while OFFSET gives the records from the given position+1. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (1.33 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 ... Read More
Use the CSS :enabled selector to style every enabled element. You can try to run the following code to implement the :enabled selector −ExampleLive Demo input:enabled { background: blue; } Subject Student: Age:
Let us first create a table −mysql> create table DemoTable -> ( -> StudentId varchar(100) -> ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John19383'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Carol9999'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('David123456'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------+ | StudentId | +-------------+ | John19383 ... Read More
To style every element that has no children with CSS, use the: empty selector t. You can try to run the following code to implement the: empty selectorExampleLive Demo p.demo { width: 300px; height: 20px; background: gray; } p:empty { width: 150px; height: 20px; background: orange; } This is demo text. Below is empty text.
Use the CSS :empty selector to style every element that has no children with CSS. You can try to run the following code to implement the :empty selector −ExampleLive Demo p.demo { width: 300px; height: 20px; background: gray; } p:empty { width: 150px; height: 20px; background: orange; } This is demo text. Below is empty text.