Liquibase YAML – Preconditions

Solution for Liquibase YAML – Preconditions
is Given Below:

I’m trying to check if a table exists, then execute a changeset. But it seems the precondition is not executed properly. Any suggestions on how to check if table exists and execute a statement?

Liquibase Script:

databaseChangeLog:
- preConditions:
  - onFail: MARK_RAN
  - sqlCheck:
      expectedResult: 1
      sql: SELECT count(*) FROM information_schema.TABLES WHERE TABLE_NAME = TABLE_MAY_NOT_EXIST
- changeSet:
    id: 1001001
    author: upgrade_author
    changes:
    - sql:
        sql: UPDATE MY_TABLE SET COL_A = (SELECT TOP 1 COL_A FROM TABLE_MAY_NOT_EXIST ORDER BY COL_A DESC)
        stripComments:  true

Error Log:

Caused by: liquibase.exception.DatabaseException: Table "TABLE_MAY_NOT_EXIST" not found; SQL statement:
UPDATE MY_TABLE SET COL_A = (SELECT TOP 1 COL_A FROM TABLE_MAY_NOT_EXIST ORDER BY COL_A DESC) [42102-197] [Failed SQL: UPDATE MY_TABLE SET COL_A = (SELECT TOP 1 COL_A FROM TABLE_MAY_NOT_EXIST ORDER BY COL_A DESC)]
    at liquibase.executor.jvm.JdbcExecutor$ExecuteStatementCallback.doInStatement(JdbcExecutor.java:356) ~[liquibase-core-3.6.3.jar:na]
    at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:57) ~[liquibase-core-3.6.3.jar:na]
    at liquibase.executor.jvm.JdbcExecutor.execute(JdbcExecutor.java:125) ~[liquibase-core-3.6.3.jar:na]
    at liquibase.database.AbstractJdbcDatabase.execute(AbstractJdbcDatabase.java:1229) ~[liquibase-core-3.6.3.jar:na]
    at liquibase.database.AbstractJdbcDatabase.executeStatements(AbstractJdbcDatabase.java:1211) ~[liquibase-core-3.6.3.jar:na]
    at liquibase.changelog.ChangeSet.execute(ChangeSet.java:600) ~[liquibase-core-3.6.3.jar:na]

I see you have missed out the properties file for liquibase, you can find the method to write the liquibase properties file here

Also, changelog files can be created as explained here