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Articles by Rishi Rathor
Page 6 of 10
How to detect shake gesture using Swift?
To detect a shake gesture in iOS UIKit provides three different methods, let’s see them one by one.Method 1 − When the shake gesture begins.override func motionBegan(_ motion: UIEvent.EventSubtype, with event: UIEvent?) { // code you want to implement }Method 2 − When the shake gesture ends.override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) { // Code you want to implement. }Method 3 − when the shake gesture is cancelled.override func motionCancelled(_ motion: UIEvent.EventSubtype, with event: UIEvent?) { // code you want to implement. }Now let’s add some code in our motionBegan method, override func motionBegan(_ motion: UIEvent.EventSubtype, with event: ...
Read MoreMySQL Sum Query with IF Condition using Stored Procedure
The Sum() is an aggregate function in MySQL. You can use sum query with if condition. To understand the sum query with if condition, let us create a table.The query to create a table −mysql> create table SumWithIfCondition −> ( −> ModeOfPayment varchar(100) −> , −> Amount int −> ); Query OK, 0 rows affected (1.60 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into SumWithIfCondition values('Offline', 10); Query OK, 1 row affected (0.21 sec) mysql> insert into SumWithIfCondition values('Online', 100); Query OK, 1 row affected ...
Read MoreMySQL Select Multiple VALUES?
To select multiple values, you can use where clause with OR and IN operator.The syntax is as follows −Case 1 − Using ORselect *from yourTablename where yourColumnName = value1 or yourColumnName = value2 or yourColumnName = value3, .........N;Case 2 − Using INselect *from yourTableName where yourColumnName IN(value1, value2, ....N);To understand the above syntax, let us create a table. The following is the query to create a table −mysql> create table selectMultipleValues −> ( −> BookId int, −> BookName varchar(200) −> ); Query OK, 0 rows affected (1.68 sec)Now you can insert some records in the table with the help of ...
Read MoreHow do you force MySQL LIKE to be case sensitive?
To force MySQL LIKE to be case sensitive with the help of LIKE BINARY, the following is the syntax −select yourColumnName like binary 'anyStringValue' from yourTableName;To understand the above concept, let us create a table. The following is the query to create a table −mysql> create table LikeBinaryDemo −> ( −> Name varchar(200) −> ); Query OK, 0 rows affected (0.58 sec)Now you can insert records with small letters to force the MySQL LIKE to be case sensitive −mysql> insert into LikeBinaryDemo values('john'); Query OK, 1 row affected (0.12 sec)Display the records in the table. The query ...
Read MoreGet date format DD/MM/YYYY with MySQL Select Query?
Use the STR_TO_DATE() function from MySQL to set a date format for displaying DD/MM/YYYY date. The syntax is as follows −SELECT STR_TO_DATE(yourColumnName, ’%d/%m/%Y) as anyVariableName from yourTableName.To understand the above syntax, let us create a table −mysql> create table DateFormatDemo −> ( −> IssueDate varchar(100) −> ); Query OK, 0 rows affected (0.54 sec)Inserting some string dates into the table. The query to insert date is as follows −mysql> insert into DateFormatDemo values('26/11/2018'); Query OK, 1 row affected (0.14 sec) mysql> insert into DateFormatDemo values('27/11/2018'); Query OK, 1 row affected (0.18 sec) mysql> ...
Read MoreHow to cast DATETIME as a DATE in MySQL?
To cast DATETIME as a DATE in MySQL, use the CAST() function. The syntax is as follows −select cast(yourColumnName as Date) as anyVariableName from yourTableName;To understand the above syntax, let us first create a table −mysql> create table ConvertDatetimeToDate −> ( −> YourDatetime datetime −> ); Query OK, 0 rows affected (0.95 sec)Inserting datetime into the table with the help of insert command. The query is as follows −mysql> insert into ConvertDatetimeToDate values(date_add(now(), interval 1 day)); Query OK, 1 row affected (0.17 sec) mysql> insert into ConvertDatetimeToDate values(date_add(now(), interval -1 day)); Query OK, 1 row affected (0.15 sec) ...
Read MoreAdd a temporary column with a value in MySQL?
You can add a temporary column with value with the help of the following syntax −select yourColumnName1, yourColumnName2, .....N ,yourTemporaryColumnValue as yourTemporaryColumnName from yourTableName;To add a temporary column with a value, let us create a table. The following is the query −mysql> create table TemporaryColumnWithValueDemo −> ( −> StudentId int, −> StudentName varchar(100) −> ); Query OK, 0 rows affected (0.59 sec)Inserting some records in the table. The query to insert records are as follows −mysql> insert into TemporaryColumnWithValueDemo values(101, 'John'); Query OK, 1 row affected (0.13 sec) mysql> insert into ...
Read MoreHow can we fetch alternate odd numbered records from MySQL table?
To understand this concept, we are using the data from table ‘Information’ as follows −mysql> Select * from Information; +----+---------+ | id | Name | +----+---------+ | 1 | Gaurav | | 2 | Ram | | 3 | Rahul | | 4 | Aarav | | 5 | Aryan | | 6 | Krishan | +----+---------+ 6 rows in set (0.00 sec)Now, the query below will fetch the alternate odd-numbered records from the above table ‘Information’ −mysql> Select id,Name from information group by id having mod(id,2) = 1; +----+--------+ | id | Name | +----+--------+ | 1 | Gaurav | | 3 | Rahul | | 5 | Aryan | +----+--------+ 3 rows in set (0.09 sec)
Read MoreWhat are the limitations for replicating stored procedure and functions?
Followings are the limitations for replicating stored procedure and functions −Type of Action − Actually the replication of stored procedure and functions depends upon the type of action. If the action, embedded in stored procedures, is nondeterministic (random) or time-based then it may not replicate properly. By their very nature, randomly produced results are not predictable and cannot be exactly reproduced, and therefore, random actions replicated to a slave will not mirror those performed on a master.Type of transaction − non-transactional tables for which errors occur during large DML actions (such as bulk inserts) may experience replication issues in that ...
Read MoreWhat MySQL returns if I do not use the keyword 'RIGHT' or 'LEFT' while writing the query for RIGHT JOIN or LEFT JOIN?
In both the cases i.e. on not using ‘RIGHT’ or ‘LEFT’ keyword in the query, MySQL will return the result by taking it as INNER JOIN query. It is because the only difference between RIGHT, LEFT and INNER JOIN is the keyword of RIGHT or LEFT. To understand it, we are taking the example of two tables named tbl_1 and tbl_2 which are having following data −mysql> Select * from tbl_1; +----+--------+ | Id | Name | +----+--------+ | 1 | Gaurav | | 2 | Rahul | | 3 | Raman | ...
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