COUNT_IF syntax, parameters, and return values - MaxCompute

Counts the number of records for which the expression (expr) evaluates to True.

Usage notes

MaxCompute V2.0 provides additional functions. If the functions that you use involve new data types, including TINYINT, SMALLINT, INT, FLOAT, VARCHAR, TIMESTAMP, and BINARY, you must execute a statement to enable the MaxCompute V2.0 data type edition:
- Session level: Add set odps.sql.type.system.odps2=true; before the SQL statement that you want to execute, and commit and execute them together.
- Project level: The project owner can enable the MaxCompute V2.0 data type edition for the project based on the project requirements. Statement:
```
setproject odps.sql.type.system.odps2=true;
```
  The configuration takes effect after 10 to 15 minutes.
  For more information about setproject, see Project operations. For more information about the precautions that you must take when you enable the MaxCompute V2.0 data type edition at the project level, see Data type editions.
If you use an SQL statement that includes multiple aggregate functions and the project resources are insufficient, memory overflow may occur. We recommend that you optimize the SQL statement or purchase computing resources based on your business requirements.

Syntax

bigint count_if(boolean <expr>)

Parameters

expr: required. A BOOLEAN expression.

Return value

A value of the BIGINT type is returned. If the value of expr is False or the value of the column specified in expr is NULL, the row is not counted.

Sample data

This section provides sample source data and examples for you to understand how to use the functions. Create a table named emp and insert the sample data into the table. Sample statement:

create table if not exists emp
   (empno bigint,
    ename string,
    job string,
    mgr bigint,
    hiredate datetime,
    sal bigint,
    comm bigint,
    deptno bigint);
tunnel upload emp.txt emp; -- Replace emp.txt with the actual path (path and name) to which you upload the data file.

The emp.txt file contains the following sample data:

7369,SMITH,CLERK,7902,1980-12-17 00:00:00,800,,20
7499,ALLEN,SALESMAN,7698,1981-02-20 00:00:00,1600,300,30
7521,WARD,SALESMAN,7698,1981-02-22 00:00:00,1250,500,30
7566,JONES,MANAGER,7839,1981-04-02 00:00:00,2975,,20
7654,MARTIN,SALESMAN,7698,1981-09-28 00:00:00,1250,1400,30
7698,BLAKE,MANAGER,7839,1981-05-01 00:00:00,2850,,30
7782,CLARK,MANAGER,7839,1981-06-09 00:00:00,2450,,10
7788,SCOTT,ANALYST,7566,1987-04-19 00:00:00,3000,,20
7839,KING,PRESIDENT,,1981-11-17 00:00:00,5000,,10
7844,TURNER,SALESMAN,7698,1981-09-08 00:00:00,1500,0,30
7876,ADAMS,CLERK,7788,1987-05-23 00:00:00,1100,,20
7900,JAMES,CLERK,7698,1981-12-03 00:00:00,950,,30
7902,FORD,ANALYST,7566,1981-12-03 00:00:00,3000,,20
7934,MILLER,CLERK,7782,1982-01-23 00:00:00,1300,,10
7948,JACCKA,CLERK,7782,1981-04-12 00:00:00,5000,,10
7956,WELAN,CLERK,7649,1982-07-20 00:00:00,2450,,10
7956,TEBAGE,CLERK,7748,1982-12-30 00:00:00,1300,,10

Examples

select count_if(sal > 1000), count_if(sal <=1000) from emp;

Output:

+------------+------------+
| _c0        | _c1        |
+------------+------------+
| 15         | 2          |
+------------+------------+

Related functions

COUNT_IF is an aggregate function. For more information about functions that calculate average values or aggregate parameters from multiple input records, see Aggregate functions.