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MySQL Articles
Page 270 of 355
Is there any way to use values from a JSON object in a MySQL Select statement?
Yes, you can use json_extract(). Let us first create a table −mysql> create table DemoTable -> ( -> Data json -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('{"Name": "John", "CountryName": "US"}'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values('{"Name": "Chris", "CountryName": "UK"}'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+----------------------------------------+ | Data ...
Read MoreHow to check if a datetime value equals tomorrows date in MySQL?
For this, you can use DATEDIFF(). Let us first create a table −mysql> create table DemoTable -> ( -> ShippingDate datetime -> ); Query OK, 0 rows affected (0.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-07-01'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('2019-07-02'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-07-03'); Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values('2019-07-04'); Query OK, 1 row affected (0.15 sec)Display all records ...
Read MoreSTR_TO_DATE as column, but column not found?
You can use having clause. Let us first create a table −mysql> create table DemoTable -> ( -> AdmissionDate varchar(100) -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10/12/2017'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('01/11/2018'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('31/01/2019'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('09/06/2019'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('19/04/2019'); Query OK, 1 ...
Read MoreMySQL query to delete all rows older than 30 days?
To delete all rows older than 30 days, you need to use the DELETE with INTERVAL. Use < now() i.e. less than operator to get all the records before the current date.Let us first create a table −mysql> create table DemoTable -> ( -> UserMessage text, -> UserMessageSentDate date -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Hi', '2019-06-01'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Hello', '2019-07-02'); Query OK, 1 row affected (0.14 sec) mysql> insert ...
Read MoreMySQL query to select rows except first row in descending order?
Let us first create a table −mysql> create table DemoTable -> ( -> Amount int -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+--------+ | Amount ...
Read MoreCount the number of distinct values in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100), -> Code 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', '0001'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Robert', '0002'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Robert', '0003'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris', '0001'); Query OK, 1 row affected (0.12 sec)Display all records from the table using ...
Read MoreFetch records containing a specific character twice in MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Words text -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Ever'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Forever'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Good'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Never'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+---------+ | Words ...
Read MoreHow do I search and replace specific chars at the beginning of a string in MySQL?
For this, you can use INSERT(). Let us first create a table −mysql> create table DemoTable -> ( -> ZipCode varchar(200) -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('9030'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('3902'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('9083'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('9089'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement ...
Read MoreUpdate table with duplicate ids in MySQL
Following is the syntax −update yourTableName set yourColumnName1= yourValue where yourColumnName2=yourValue order by yourColumnName2 DESC LIMIT 1;Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 'John'); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(2, 'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(2, 'Robert'); Query OK, 1 row affected (0.14 sec) mysql> insert into ...
Read MoreMultiply values of two columns and display it a new column in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> NumberOfItems int, -> Amount int -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(4, 902); Query OK, 1 row affected (0.45 sec) mysql> insert into DemoTable values(5, 1000); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(3, 80); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+---------------+--------+ | NumberOfItems | Amount | +---------------+--------+ | ...
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