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MySQL Articles
Page 38 of 355
How can I implement an interval condition for due dates correctly in MySQL?
Let us first create a table −mysql> create table DemoTable (DueDate date); Query OK, 0 rows affected (0.92 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-12'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2019-04-01'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-07-19'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+------------+ | DueDate | +------------+ | 2019-01-12 | | 2019-04-01 | | 2019-07-19 | +------------+ 3 rows in set (0.00 sec)Following is the query to ...
Read MoreGet a fixed number of results in descending order using a MySQL query
For descending order result, use DESC. However, LIMIT is used to get fixed number of records −select *from yourTableName order by yourColumnName DESC LIMIT yourLimitNumber;Let us first create a table −mysql> create table DemoTable (Id int, Name varchar(100)); Query OK, 0 rows affected (0.73 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values(100, 'John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(102, 'Robert'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103, 'Bob'); Query OK, ...
Read MoreRound seconds to nearest half minute in MySQL?
To round seconds to nearest half minute, use CEILING(). Let us first create a table −mysql> create table DemoTable (secondValue int); Query OK, 0 rows affected (0.64 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values(27); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(56); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(118); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-------------+ | secondValue | +-------------+ | 27 | | 56 ...
Read MoreSelect three random records with a fixed number of characters for each column value in MySQL
For this, you can use CHAR_LENGTH(). Use RAND() for random records. Let us first create a table −mysql> create table DemoTable (Subject text); Query OK, 0 rows affected (0.61 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('C'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('MySQL'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('MongoDB'); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values('RubyOnRails'); Query OK, 1 row affected (0.25 sec) mysql> insert ...
Read MoreMySQL query to select top n rows efficiently?
Use index to select top n rows efficiently. Let us first create a table −mysql> create table DemoTable (StudentName varchar(100), StudentScore int ); Query OK, 0 rows affected (0.66 sec)ExampleInsert some records in the table using insert command −mysql> insert into DemoTable values('John', 34); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Carol', 55); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Bob', 58); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Sam', 38); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Mike', 48); Query OK, 1 row ...
Read MoreSwap data between two columns in MySQL?
To swap data between two columns in MySQL, use the concept of variable. Let us first create a table. Here, we will swap Name1 with Name2 −mysql> create table DemoTable -> ( -> Name1 varchar(100), -> Name2 varchar(100) -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John Smith', 'Chris Brown'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('David Miller', 'Jone Doe'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce ...
Read MoreMySQL stored procedure to return a column value?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Score int -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 858858686); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(2, 9900554); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(3, 646565667); 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 −+------+-----------+ | Id ...
Read MoreMySQL query to add dots if string has more than 10 words?
For this, use CASE statement. Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('My name is John and this is my first tutorial on MySQL'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('This is Carol and I work on MongoDB'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+--------------------------------------------------------+ | Title ...
Read MoreIncrease database field value by specified percentage using user-defined variables in MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Amount int -> ); Query OK, 0 rows affected (0.99 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(200); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(500); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+--------+ | Amount | +--------+ | 100 | | 200 ...
Read MoreAdd values of two columns considering NULL values as zero in MySQL
For this, use COALESCE() function from MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 200); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(NULL, 90); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(NULL, NULL); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(600, NULL); Query OK, 1 row affected (0.12 sec)Display all records from ...
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