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Articles by Samual Sam
Page 143 of 151
Using MySQL SELECT for simple BOOLEAN evaluation?
You can use CASE statement for this. Let us see an example −mysql> create table BooleanEvaluationDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstValue int, -> SecondValue int -> ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into BooleanEvaluationDemo(FirstValue, SecondValue) values(10, 5); Query OK, 1 row affected (0.20 sec) mysql> insert into BooleanEvaluationDemo(FirstValue, SecondValue) values(15, 20); Query OK, 1 row affected (0.16 sec) mysql> insert into BooleanEvaluationDemo(FirstValue, SecondValue) values(50, 40); Query OK, 1 row affected (0.14 ...
Read MoreCreate Quartet Tuple from another collection in Java
Use the fromCollection() method to create Quartet Tuple from another collection i.e. we will see an example of List here.Let us first see what we need to work with JavaTuples. To work with Quartet class in JavaTuples, you need to import the following package −import org.javatuples.Quartet;Note − Steps to download and run JavaTuples program If you are using Eclipse IDE to run Quartet Class in JavaTuples, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file.The following is an example −Exampleimport java.util.*; import org.javatuples.Quartet; public class Demo { ...
Read MoreHow to convert all the records in a MySQL table from uppercase to lowercase?
Convert all the records in a MySQL table from uppercase to lowercase using UPDATE command along with LOWER() method.Let us first create a table −mysql> create table DemoTable ( Id varchar(100), StudentFirstName varchar(20), StudentLastName varchar(20), StudentCountryName varchar(10) ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('STU-101', 'John', 'Smith', 'US'); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values('STU-102', 'John', 'Doe', 'UK'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('STU-103', 'David', 'Miller', 'AUS'); Query OK, 1 ...
Read MoreHow to count all characters in all rows of a field in MySQL?
The syntax is as follows to count all characters in all rows of a field −select sum(char_length(yourColumnName)) AS anyAliasName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table CountAllCharactersDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20), -> UserSubject text -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into CountAllCharactersDemo(UserName, UserSubject) values('Larry', 'Introduction To Java'); Query OK, 1 row affected (0.19 ...
Read MoreHow to select part of a Timestamp in a MySQL Query?
To select part of a timestamp in a query, you need to use YEAR() function. The syntax is as follows in MySQL.select YEAR(yourTimestampColumnName) as anyAliasName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table SelectPartOfTimestampDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ShippingTime TIMESTAMP -> ); Query OK, 0 rows affected (1.11 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> ...
Read MoreWhy can't we use column name "desc" in MySQL?
The desc is a MySQL reserved word, therefore you cannot use it. But, if you still want to set the column name as ‘desc’, you need to use backticks. The backtick notation is (` `).To understand the above concept, let us create a table. The query to create a table is as follows −mysql> create table useOfDescColumnNameDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> `desc` varchar(200) default 'GOOD' -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command. The query is as follows ...
Read MoreHow to print result of a java expression in JSP?
The tag displays the result of an expression. This is almost similar to the way works. The difference here is that tag lets you use the simpler "." notation to access properties. For example, to access customer.address.street, use the tag .The tag can automatically escape XML tags so they aren't evaluated as actual tags.AttributeThe tag has the following attributes −AttributeDescriptionRequiredDefaultValueInformation to outputYesNonedefaultFallback information to outputNobodyescapeXmlTrue if the tag should escape special XML charactersNotrueExample Tag Example The above code will generate the following result − , &
Read MoreHow to select all rows from a table except the last one in MySQL?
You need to use != operator along with subquery. The syntax is as follows −select *from yourTableName where yourIdColumnName != (select max(yourIdColumnName) from yourTableName );To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table AllRecordsExceptLastOne -> ( -> Id int NOT NULL AUTO_INCREMENT, -> UserName varchar(10), -> UserAge int -> , -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.65 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> ...
Read MoreCount boolean field values within a single MySQL query?
To count boolean field values within a single query, you can use CASE statement. Let us create a demo table for our example −mysql> create table countBooleanFieldDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentFirstName varchar(20), -> isPassed tinyint(1) -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into countBooleanFieldDemo(StudentFirstName, isPassed) values('Larry', 0); Query OK, 1 row affected (0.12 sec) mysql> insert into countBooleanFieldDemo(StudentFirstName, isPassed) values('Mike', 1); Query OK, 1 row affected (0.17 sec) mysql> insert into ...
Read MoreHow to apply forEach tag in JSP?
The tag is a commonly used tag because it iterates over a collection of objects. The tag is used to break a string into tokens and iterate through each of the tokens.AttributeThe tag has the following attributes −AttributeDescriptionRequiredDefaultitemsInformation to loop overNoNonebeginElement to start with (0 = first item, 1 = second item, ...)No0endElement to end with (0 = first item, 1 = second item, ...)NoLast elementstepProcess every step itemsNo1varName of the variable to expose the current itemNoNonevarStatusName of the variable to expose the loop statusNoNoneExample for Tag Example Item The above code will generate the following result −Item 1 Item 2 Item 3 Item 4 Item 5
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