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* delete asciidoc files
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This reverts commit 8be688648d.
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---------
Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
70 lines
1.3 KiB
Markdown
70 lines
1.3 KiB
Markdown
---
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/reference/current/sql-operators.html
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---
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# Comparison Operators [sql-operators]
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Boolean operator for comparing against one or multiple expressions.
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## `Equality (=)` [sql-operators-equality]
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```sql
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SELECT last_name l FROM "test_emp" WHERE emp_no = 10000 LIMIT 5;
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```
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## `Null safe Equality (<=>)` [sql-operators-null-safe-equality]
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```sql
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SELECT 'elastic' <=> null AS "equals";
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equals
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---------------
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false
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```
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```sql
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SELECT null <=> null AS "equals";
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equals
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---------------
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true
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```
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## `Inequality (<> or !=)` [sql-operators-inequality]
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```sql
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SELECT last_name l FROM "test_emp" WHERE emp_no <> 10000 ORDER BY emp_no LIMIT 5;
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```
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## `Comparison (<, <=, >, >=)` [sql-operators-comparison]
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```sql
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SELECT last_name l FROM "test_emp" WHERE emp_no < 10003 ORDER BY emp_no LIMIT 5;
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```
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## `BETWEEN` [sql-operators-between]
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```sql
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SELECT last_name l FROM "test_emp" WHERE emp_no BETWEEN 9990 AND 10003 ORDER BY emp_no;
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```
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## `IS NULL/IS NOT NULL` [sql-operators-is-null]
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```sql
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SELECT last_name l FROM "test_emp" WHERE emp_no IS NOT NULL AND gender IS NULL;
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```
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## `IN (<value1>, <value2>, ...)` [sql-operators-in]
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```sql
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SELECT last_name l FROM "test_emp" WHERE emp_no IN (10000, 10001, 10002, 999) ORDER BY emp_no LIMIT 5;
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```
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