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MySQLi Articles
Page 185 of 341
MySQL query to fetch only a single field on the basis of boolean value in another field
Let us first create a table −mysql> create table DemoTable ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(40), isMarried boolean ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, isMarried) values('Chris', true); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Robert', false); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Mike', false); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Bob', true); Query OK, 1 row affected (0.07 sec) mysql> insert into ...
Read MoreHow to insert an array of values in a MySQL table with a single INSERT?
Let us first create a table −mysql> create table DemoTable ( ClientId int, ClientName varchar(50) ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command. Here, we are inserting multiple values using only a single INSERT −mysql> insert into DemoTable values(101,'Adam'),(102,'Chris'),(103,'Robert'),(104,'Sam'),(105,'Mike'); Query OK, 5 rows affected (0.16 sec) Records: 5 Duplicates: 0 Warnings: 0Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------+------------+ | ClientId | ClientName | +----------+------------+ | 101 | Adam | | 102 | Chris | | 103 | Robert | | 104 | Sam | | 105 | Mike | +----------+------------+ 5 rows in set (0.00 sec)
Read MoreHow to structure some data in a MySQL database for easier retrieval?
You can use FIND_IN_SET to structure some data in a database for easier retrieval. Let us first create a table −mysql> create table DemoTable ( CountryName SET('US', 'UK', 'AUS') ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('US'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('UK'); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-------------+ | CountryName | +-------------+ | US ...
Read MoreSelect rows from a table with date between 90 days ago and now in MySQL
Use MySQL INTERVAL for this. Let us first create a table −mysql> create table DemoTable ( DueDate date ); Query OK, 0 rows affected (1.13 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-07-10'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('2019-09-02'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-06-01'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('2019-05-10'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2019-08-21'); Query OK, 1 row affected (0.14 sec)Display all records from the table ...
Read MoreA single MySQL query to insert records (not all) in the second table from the first table
Use nested insert with select in MySQL for this as shown in the below syntax −insert into yourTableName2(yourColumnName1, yourColumnName2, .....N) select yourColumnName1, yourColumnName2, ....N from yourTableName1 where yourCondition;Let us first see an example and create a table −mysql> create table DemoTable1 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(40) ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1(Name) values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1(Name) values('David'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1(Name) values('Bob'); Query OK, ...
Read MoreWhat happens when you insert nothing after declaring a column "timestamp default CURRENT_TIMESTAMP"?
In this case, the current timestamp gets inserted into the table column. Let us first create a table −mysql> create table DemoTable ( ArrivalDate timestamp default CURRENT_TIMESTAMP ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(now()); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+ | ArrivalDate | +---------------------+ | 2019-09-01 14:08:47 | | 2019-09-01 14:08:50 | +---------------------+ 2 rows in set (0.00 sec)
Read MoreConvert a stored MD5 string to a decimal value in MySQL?
You can use the conv() function along with the cast() to cast from hexadecimal to a decimal value.Note − MD5 is in hexadecimalLet us first create a table −mysql> create table DemoTable ( Password text ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values("a5391e96f8d48a62e8c85381df108e98"); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values("ea7a32d2dc5bb793af262dcb6ea1a54d"); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------------------------------+ | Password ...
Read MoreWhich is the fastest way to get a column's maximum value in MySQL?
You can try to get a column’s maximum value using two ways. The first way is as follows −select max(yourColumnName) from yourTableName;The second way is as follows −select yourColumnName from yourTableName order by yourColumnName DESC LIMIT 1;NOTE − The first query takes less time than the second query because the second query first sort n number of values then gives the highest value using LIMIT 1. Therefore, use the first query.Let us first create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command ...
Read MoreSelecting from a MySQL table based on parts of a timestamp?
Let us first create a table −mysql> create table DemoTable ( AdmissionDate timestamp ); Query OK, 0 rows affected (0.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2007-01-10'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('2015-07-12'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('2017-11-01'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('2019-08-29'); Query OK, 1 row affected (0.08 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+ | AdmissionDate ...
Read MoreMySQL query to fetch column length declared with BLOB type
For this, use the LENGTH() function from MySQL. Let us first create a table. We have declared the type of column as BLOB −mysql> create table DemoTable ( Title blob ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('This is a MySQL tutorial'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Java is an object oriented programming language'); Query OK, 1 row affected (0.61 sec) mysql> insert into DemoTable values('C is a procedural language'); Query OK, 1 row affected (0.20 sec)Display all records from ...
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