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MySQL Articles
Page 276 of 355
MySQL DateTime Now()+5 days/hours/minutes/seconds?
To update the current date and time to 5 days, you need to use the Now() + 5. That would update the entire date-time i.e. days, hour, minutes and seconds. To understand this, let us create a table. The query to create a table is as follows −mysql> create table UserInformationExpire -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(10), -> UserInformationExpireDateTime datetime not null -> ); Query OK, 0 rows affected (0.83 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> ...
Read MoreMySQL If statement with multiple conditions?
You can use if statement in a stored procedure with multiple conditions with the help of AND or OR operator. The syntax is as follows −DECLARE X int; DECLARE Y int; SET X = value1; SET Y = value2; IF ( (X < Y AND X > value1 AND Y >value2) OR X! = anyValueToCompare) THEN yourStatement; ELSE yourStatement; END IFNow to understand the above syntax, let us create a stored procedure. The query to create a stored procedure is as follows −mysql> create procedure SP_IFELSEDEMO() -> BEGIN -> DECLARE X int; -> DECLARE Y ...
Read MoreSum if all rows are not null else return null in MySQL?
You can achieve this with the help of GROUP BY HAVING clause. The syntax is as follows −SELECT yourColumnName1, SUM(yourCoumnName2) from yourTableName GROUP BY yourColumnName1 HAVING COUNT(yourCoumnName2) = COUNT(*);To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table SumDemo -> ( -> Id int, -> Amount int -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into SumDemo values(1, 200); Query OK, 1 row affected (0.22 ...
Read MoreMySQL "order by" inside of "group by"? Is it possible?
Instead of using ORDER BY inside GROUP BY, you can use the MAX() aggregate function.The syntax is as follows −SELECT yourNameColumnName, MAX(yourRankColumnName) FROM yourTableName GROUP BY yourNameColumnName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table MaxDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20), -> UserRank int -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into MaxDemo(UserName, UserRank) values('Larry', 2); Query ...
Read MoreDoes it make sense to use "LIMIT 1" in a query "SELECT 1 ..."?
Yes, you can use LIMIT 1 with SELECT1.Suppose, you are using SELECT 1 and your table has billions of records. In this case, it will print 1 billion times.The syntax of SELECT 1 is as follows −SELECT 1 FROM yourTableName;Suppose, you are using LIMIT 1 and your table has billions of records. This case, it will print 1 only once.The syntax of SELECT 1 with LIMIT 1 is as follows −SELECT 1 FROM yourTableName LIMIT 1;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table Select1AndLimit1Demo -> ...
Read MoreDisplay the warning message when a FLOAT value is inserted into DECIMAL in MySQL?
You can create a temporary table with data type DECIMAL to get a warning when a float value is inserted into an int column. Display the same warning using SHOW WARNINGS.Let us create a table to understand. The query is as follows to create a table.mysql> create temporary table WarningDemo -> ( -> Value DECIMAL -> ); Query OK, 0 rows affected (0.13 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into WarningDemo values(9.80); Query OK, 1 row affected, 1 warning (0.03 sec)Here we are getting a warning. Let ...
Read MoreSelect query using MySQL IN() and avoid sorting in it
Using IN() sorts the result for the specific field. To avoid this, use ORDER BY and FIND_IN_SET() for the field.To understand the find_in_set(), let us create a table. The query to create a table is as follows −mysql> create table ProductStock -> ( -> ProductId int, -> ProductName varchar(20), -> ProductQuantity int, -> ProductPrice float -> ); Query OK, 0 rows affected (0.79 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into ProductStock values(1, 'Product-101', 10, 500.56); Query OK, 1 row affected (0.20 ...
Read MoreCreate an aggregate checksum of a column in MySQL
You can use CRC32 checksum for this. The syntax is as follows −SELECT SUM(CRC32(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 CRC32Demo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserId varchar(20) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into CRC32Demo(UserId) values('USER-1'); Query OK, 1 row affected (0.38 sec) mysql> insert into CRC32Demo(UserId) values('USER-123'); Query OK, 1 row ...
Read MoreExtract tuples with specified common values in another column in MySQL?
To extract tuples with specified common values, use the following syntax −SELECT DISTINCT aliasName.yourColumnName1, aliasName.yourColumnName2, aliasName1.yourColumnName 1, aliasName1.yourColumnName2 FROM yourTableName aliasName INNER JOIN yourTableName aliasName1 ON aliasName.yourColumnName1 = aliasName1.yourColumnName1 WHERE aliasName.yourColumnName2 = 'value1' AND aliasName1.yourColumnName2 = 'value2';To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table extractTuples -> ( -> Id int, -> Name varchar(20), -> Comments text -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ...
Read MoreHow to write a MySQL "LIMIT" in SQL Server?
You need to use TOP(1) in SQL Server. The syntax is as follows −SELECT TOP(1) *FROM yourTableName WHERE yourCondition;To understand the above syntax, let us create a table. The query to create a table is as follows −create table TopDemoInSQLServer ( Id int, Name varchar(10) );The snapshot of creation of table is as follows −Insert some records in the table using insert command. The query is as follows −insert into TopDemoInSQLServer values(10, 'John'); insert into TopDemoInSQLServer values(14, 'Carol'); insert into TopDemoInSQLServer values(1, 'Sam'); insert into TopDemoInSQLServer values(11, 'Bob'); insert into TopDemoInSQLServer values(18, 'David'); insert into TopDemoInSQLServer values(20, 'Sam');The ...
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