Getting all results using where clause

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I have a function which takes an argument that is used in where clause

function(string x)-->Now this will create a sql query which gives

select colname from tablename where columnname=x;

Now I want this function to give all rows i.e. query equivalent to

select colname from tablename;

when I pass x="All".

I want to create a generic query that when I pass "All" then it should return me all the rows else filter my result.

Just leave the where condition out.

If you really want it that complicated use

where columnname LIKE '%'

which will only filter nulls.

Get all results using WHERE clause in MySQL?, You get instructions on how to install the free tools and sample database. The WHERE Clause. A where clause is a condition that must be met in order for a row to  To get all results using WHERE clause, you can use LIKE operator. We can also get all the results using “Select * from table_name”. Let us first create a table: mysql> create table DemoTable (Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20)); Query OK, 0 rows affected (0.56 sec)

select colname from tablename 
where columnname=(case when @x ="All" then columnname
                  else  @x end)

How to Filter Query Results using WHERE, It is very common to use a subquery in the WHERE clause. You can get started using these free tools using my Guide Getting Started Using SQL Server. ANY or > ALL to compare a column value to a list results returned from the subquery. WHERE clause Syntax. The basic syntax for the WHERE clause when used in a SELECT statement is as follows. SELECT * FROM tableName WHERE condition; HERE "SELECT * FROM tableName" is the standard SELECT statement "WHERE" is the keyword that restricts our select query result set and "condition" is the filter to be applied on the results. The filter could be a range, single value or sub query.

Try this

select colname from tablename where 1=1

hope the above will work

Subquery in the WHERE Clause, MySQL Where clause' is used to query data from a database and also The SELECT statement returned all the results from the queried database table. Suppose we want to get a member's personal details from members  You need a UNION ALL clause to specify both selections. In your example you need something like this: SELECT tbl1.HdrCode, tbl1.HdrName FROM Table1 tbl1 WHERE tbl1.HdrCode IN ('000520','000531','000636') UNION ALL SELECT tbl1.HdrCode, tbl1.HdrName FROM Table1 tbl1 WHERE tbl1.HdrCode IN ('000531') ORDER BY HdrCode This is the SqlFiddle.

SELECT * FROM table_name WHERE 1;
SELECT * FROM table_name WHERE 2;
SELECT * FROM table_name WHERE 1 = 1;
SELECT * FROM table_name WHERE true;

Any of the above query will return all records from table. In Node.js where I had to pass conditions as parameter I used it like this.

const queryoptions = req.query.id!=null?{id : req.query.id } : true;
let query = 'SELECT * FROM table_name WHERE ?';
db.query(query,queryoptions,(err,result)=>{
res.send(result);
}

MySQL WHERE Clause with Examples, Since "Joe" matched the NOT statement, it's excluded from the results. When you use the IN operator, the SQL language first gets all of the values that match. Unlike MySQL You can't use column aliases in the having clause in SQL Server. +1 For the second query though which will potentially be more efficient as it allows an index range seek rather than an entire scan. – Martin Smith Dec 30 '10 at 12:07

where 1=1 worked for me, Although where clause was being used all records were selected.

You can also try

[any_column_name]=[column_name_in_LHL]

(LHL=left hand side.)

refer my answer for more details

Using the IN, NOT, and LIKE Operators in SQL, This SQL tutorial explains how to use the SQL WHERE clause with syntax and examples. The SQL WHERE clause is used to filter the results and apply conditions in a If you want to follow along with this tutorial, get the DDL to create the tables Because the * is used in the select, all fields from the suppliers table would  The WHERE clause can use the OR phrase instead of the AND phrase. The following statement replaces AND with OR. SELECT * FROM Customer. WHERE CustomerId >=200 OR CustomerId <= 300. ORDER BY State. The statement above says "return all customers with an ID greater than 200 or an ID less than 300." The above SELECT statement returns the following results.

SQL: WHERE Clause, Can be used by itself to retrieve all records from a table: is assigned to a variable named $query, which can be used to show the results: Compiles the selection query just like $builder->get() but does not run the query. This function enables you to set WHERE clauses using one of four methods: Note. The WHERE clause returns all records where the EXISTS clause is TRUE. The EXIST clause uses a correlated subquery. The outer query is correlated to the inner query by SalesPersonID. Only SalesPersons with SalesYTD greater than three million are included in the results.

Query Builder Class, Extensive tutorial on using the SELECT statement. This narrows the width of the results set by retrieving only three columns, but it still retrieves all of the rows​  A good time to add a ‘Where-Object’ statement is when you need to filter a list. What we are going to do is get a list of files with GCI (Get-Childitem), and then pipe the output into a ‘Where’ clause, which filters the stream according to this condition: file extension equals .exe. Example 1a: Where clause to find executable files

Getting Data from MariaDB, For example, to get all motherboards that belong to the category id 1 and have list prices greater than 500, you use the following statement: SELECT  In this SQL Server WHERE clause example, we've used the WHERE clause to filter our results from the employees table. The SELECT statement above would return all rows from the employees table where the first_name is 'Jane'. Because the * is used in the SELECT, all fields from the employees table would appear in the result set.

Comments
  • It is not explicit, but reading between the lines they appear to be using PL/SQL in MySQL.
  • Care to elaborate?
  • The "or" in the where clause is doing the trick here. If the condition columnname = x is met then the where clause filters the results. Otherwhise if the x = 'ALL' then the where clause is bypassed. Thus removing the filter.